WO2009109387A1

WO2009109387A1 - Light, in particular for obtaining a light spectrum similar to daylight

Info

Publication number: WO2009109387A1
Application number: PCT/EP2009/001566
Authority: WO
Inventors: Martin Häge; Helmut Grantz; Gunnar Helms
Original assignee: Mbb International Group Ag
Priority date: 2008-03-06
Filing date: 2009-03-05
Publication date: 2009-09-11
Also published as: DE102008013049A1; EP2260674A1

Abstract

The invention relates to a light, in particular for obtaining a light that is similar to daylight, comprising a board (12) that houses a plurality of LED-illuminating means wherein at least one white LED and at least one coloured LED (22, 23, 24) are provided as LED illuminating means. In order to obtain a uniform spectral characteristic that can be compared to sunlight in the visible range, the light comprises a predetermined number of coloured and white LEDs (16, 17, 18, 21, 22), the colour and white LEDs (16, 17, 18, 21, 22) being combined in a predetermined manner and a predetermined power control system is associated with each LED (16, 17, 18, 21, 22).

Description

Luminaire, in particular for achieving a daylight-like light spectrum

The invention relates to a luminaire, in particular for achieving a daylight-like light spectrum, with a board receiving a plurality of LED illuminants, wherein at least one white LED and at least one colored LED are provided as the LED illuminant.

There are already known lights that use white light LEDs as light sources or so-called RGB LEDs, so-called three-color LEDs, with the colors red, green and blue. The white light LEDs have the disadvantage that they are designed according to the eye sensitivity curve. For some colors, this causes a decline in the continuous color spectrum. In principle, the RGB LEDs make it possible to visually generate white light by using the three colors in the correct

CONFIRMED ^Q SKOPIE be mixed. However, this causes many colors of the continuous spectrum are not or only weakly available. For example, yellow objects are recognized only in a false color representation, since these objects are only recognized as yellow, if this wavelength is present in the light source and thus can also be reflected by the object. This is not the case with RGB LEDs or with much used three-band fluorescent tubes. In order to achieve the correct color mixing for RGB LEDs or to achieve the popular color effects, the individual colors are regulated using pulse width modulation. This is usually done with a frequency of 400 Hz, which is not perceived visually, but is very well detected by the brain and can be the cause of stress, fatigue and malaise.

The invention is therefore based on the object to provide a luminaire with LED bulbs, which generates a daylight-like spectrum and allows the simulation of the spectral daylight course.

This object is achieved by the features of claim 1. Further advantageous embodiments and further developments are specified in the further claims.

The inventive design of the luminaire, in which the number of colored and white LEDs is matched to one another, in which the combination in the arrangement of the colored and white LEDs is adapted to each other and in which a specific power control is provided for each LED, is made possible that a uniform, comparable to the sunlight in the visible range spectral response is achieved. By this vote in the selection with respect to the number of LEDs, their combination and their power control, a homogeneous illumination can be achieved without resulting in color spots.

Due to the preferred embodiment of the lamp with a first group of colored LEDs of different spectral color, which between arranged at least a second group of white LEDs or framed by these, a good color mixing is achieved, so that a daylight-like light spectrum is generated for the viewer. By this arrangement, a uniform and good superimposition of the individual spectral ranges of the LEDs is made, so that a color rendering index of at least 90 Ra is achieved.

Alternatively, it can be provided that in order to achieve a continuous, spectral response similar to sunlight in the visible range, one or more groups of such colored LEDs are combined in the shape with the white LEDs, that the wavelengths of the colored LEDs largely compensate for spectrally weakly formed wavelength ranges of the white LEDs and extend the overall spectral response of the combined light spectrum toward short and long wavelength regions. Likewise, it may alternatively be provided that the number and / or power of the respective colored LEDs is tuned so that the entire continuous spectrum in the visible range, as far as possible, extends linearly without distinct peaks and valleys.

Preferably, LED bulbs are used, which have a very wide radiation angle of, for example, a range between 60 ° and 160 °, in particular a range between 120 ° to 140 °. As a result, a relatively good mixing of the individual spectral colors can be achieved very early. Thus, a good color mixing is possible after a short distance from the bulb.

According to a further preferred embodiment of the invention, it is provided that the first group of colored LEDs comprises at least one LED with a wavelength of 490 nm to 510 nm (cyan), at least one LED with a wavelength of 590 nm to 605 nm (yellow-orange) and at least one LED having a wavelength of 625 nm to 635 (red). This spectral range differs from the commonly used RGB LEDs and has the advantage that a uniform spectral response is achieved. According to an alternative embodiment of the invention, it is provided that the luminaire comprises at least a first group of colored LEDs of at least one LED with a wavelength of 470 nm to 480 nm (blue), an LED with a wavelength of 490 nm to 510 nm (cyan). and a LED with a wavelength of 625 nm to 635 nm (red). As a result, a homogeneous spectral profile can likewise be achieved. Both in this combination of LEDs and in the aforementioned combination of colored LEDs, the basic idea is that the different LED colors are to be selected so that the colors complement each other as well as possible and overlap as little as possible. The selection and combination of colored LEDs serves to fill in a gap between the white light LEDs in order to maximize the spectrum in the range of the sensitivity curve of the eye. It is also possible to deviate from the aforementioned wavelengths of the individual colored LEDs and to select a new combination as suitable.

According to a further advantageous embodiment of the invention, it is provided that the second group of white LEDs comprises at least one warm white LED with a color temperature of 3,000 K to 4,000 K and at least one cold white LED with a color temperature of 5,400 K to 6,500 K. This achieves good color mixing and adequate illumination.

Furthermore, it is preferably provided that the light output of the second group of white LEDs is in particular a multiple greater than the light output of the colored LEDs of the first group. This ensures that the white LEDs clearly outshine the colored LEDs and the colored LEDs really only fulfill the task of filling in the spectral ranges of the white LEDs that are underrepresented.

A first advantageous embodiment of the invention provides an arrangement of the lamps in a luminaire, in which three LEDs with the colors cyan, yellow-orange and deep red form a group, arranged in a row behind one another and at least two of these groups are provided on a line one behind the other as well as left and right adjacent to the at least one group of colored LEDs at least a second Grup ^¬ pe is provided with white LEDs. By this arrangement, a lamp can be achieved, which can extend in a longitudinal direction of any length and achieves a good light mixture. At the same time, such a lamp can be made very narrow, so that, for example, a replacement for fluorescent tubes can be created.

In the above preferred arrangement of the group of white and colored LEDs, an arrangement of the white LEDs is preferably provided such that between a series of cold white LEDs and colored LEDs there is provided a series of warm white LEDs which are preferably spaced parallel to one another. In particular, the warm white LEDs and cold white LEDs are offset to each other in a gap. By such an arrangement, on the one hand a cost-effective design can be achieved by a small number of LEDs is required, while maintaining the requirement for a good mixing of the spectral range. Alternatively, the cold white and warm white LEDs can also be arranged alternately in a row, which allows an even narrower version of the lamp.

The arranged in a row one behind the other colored LEDs of the first group preferably have a fixed order to each other. When arranging several groups in a row, the order remains within the group. As a result, a simple modular design can be created.

According to an alternative embodiment of the invention, it is provided that the luminaire has an arrangement of LED lighting means in which the first group is arranged in a circle with colored LEDs and the second group with white LEDs surrounds the first group with colored LEDs. As a result, for example, round radiators can be formed whose diameter is variable. For example, ceiling spots can be realized as well as so-called flooters. Preferably, this circular arrangement of the LEDs has a structure in which at least three circles are formed by a respective color of the colored LEDs and at least two circles are provided by the white LEDs. The colored LEDs are preferably arranged such that near the center the color cyan, followed by the color red and farther away from the center the color yellow-orange is provided. This group of colored LEDs is surrounded by the group of white LEDs, which comprise warm white and cool white LEDs.

In the case of the circular arrangement of the warm and cold white LEDs, these are preferably arranged offset from one another. The LEDs can lie almost on the same circular line and thus form a light curtain, which envelops the colored LEDs. As a result, good mixing is achieved again.

According to a further alternative arrangement of the luminaire, it is provided that the group of colored LEDs and the group of white LEDs are both arranged on a common line and the group of colored LEDs is positioned between a group of white LEDs. This arrangement allows a very slim line light, which can be used for example as a light bar or routing.

In the linear arrangement of the group of colored LEDs and white LEDs, it is preferably provided that the group of colored LEDs is framed by two warm-white LEDs or two cold white LEDs and a warm-white or cold-white LED is additionally provided at one end of the group of white LEDs. The selection of the warm white or cold white LEDs for framing the colored group can be achieved depending on the desired shade for the daylight-like light spectrum. This allows adaptation of the luminaires to different regions, where either the warm white or more the cool white light predominates.

A further alternative embodiment for arranging the groups of colored LEDs and white LEDs provides that a group of colored LEDs is surrounded by a group of white LEDs, wherein the group of colored LEDs is preferably arranged in a triangle and the surrounding group of white LEDs comprises a square arrangement. The group with colored LEDs and the group with white LEDs form a small group, with several small groups arranged in a grid pattern. The gaps formed between the small groups are formed by cool white or warm white LEDs and the lines formed therebetween by warm white or cold white LEDs. As a result, a large-area arrangement of a lamp with a recurring structure can be created, which in turn allows an optimized light spectrum.

In this alternative embodiment, the rows and columns of the warm-white or cold-white LEDs are preferably offset or provided in a gap for the square arrangement of the group of white LEDs. This enables a uniformly distributed arrangement and enclosure of the warm white and cold white LEDs to the colored LEDs.

According to a further advantageous embodiment of this alternative embodiment, it is provided that the group of white LEDs with the square arrangement is formed by two warm white and two cold white LEDs, respectively, which are arranged diagonally opposite one another. This enables a modular design of the small group and a uniform and daylight-like light spectrum can be achieved.

According to a further advantageous embodiment of the invention, it is provided that at least two LEDs of the same color form a strand and the strand-forming LEDs are electrically connected in series. This allows a series connection for the warm white and cold white LEDs and a series circuit for yellow-orange, cyan and the deep red LEDs. Each of these LED strings preferably has its own power supply, which can be regulated independently of the others. This allows a good continuous color spectrum can be achieved. According to a further preferred embodiment of the invention, at least one light module is provided on a circuit board, and each light module comprises at least two strands, wherein preferably one strand each with three colored LEDs, a strand with warm white LEDs and a strand is constructed with cool white LEDs. As a result, a uniform control of the LEDs with the same wavelength can be created.

In addition, it is preferably possible that such light modules can be arranged by plug connections in a simple manner electrically and mechanically in a row. This allows a flexible adaptation to different sizes and light output for a luminaire. By the preferred interconnection of several strings in series, the same current source, control and regulation can be used for such a series. This ensures that each LED of a strand is controlled and regulated to the same extent, so that a uniform color mixture is ensured with multiple light modules.

According to an advantageous development of the invention it is provided that at least one light module is combined with several strands on a board on which the required power supply, control and regulation is arranged. These components may for example be provided on a circuit board. Such an arrangement forms a so-called master module. This master module makes it possible, regardless of the housing shape, to achieve an optimum lighting system and simulate the daylight process. In addition, a previously existing luminaire or a conventional lighting system can be replaced or retrofitted by the luminaire according to the invention. Due to the arrangement of the power supply and control on the master module, this master module is self-sufficient. At the same time, such a master module has the advantage that the installation in a housing for a luminaire is simplified.

Furthermore, one or more strands, which form a light module, are preferably provided on a printed circuit board and form a so-called daughter module. These daughter modules have the advantage that these can be connected to the master module and preferably connected in series and the control and regulation as well as the power supply of the daughter modules is performed by the master module. Thus, a modular design is given, which allows flexible adaptation to different geometries of the lights.

The luminaire, which preferably comprises a group of colored LEDs and at least one group of white LEDs which frames at least the group of colored LEDs, furthermore preferably has a housing with a receiving space which is delimited by wall sections, so that only externally the at least one group of colored and the at least one group of white LEDs are visible. As a result, the further, for example present on the master module electronic components for the power supply, control and regulation of the light modules for the viewer can not be arranged visible in the housing. As a result, a visually appealing design of the lamp is also possible in the off state.

Furthermore, it is preferably provided that the housing has a transparent cover and preferably under the transparent cover, an optically designed plate is arranged. This optically designed plate is designed especially for a switched-off light design reasons to create an attractive look. As an alternative to the arrangement of the optical disk with a transparent cover, a frosted or frosted cover may also be provided.

The optical plate is preferably formed with a diffractive structure for focussing or light scattering of the light radiation. This can be given an additional intensification of the light cone.

Furthermore, it is preferably provided that the optical plate has a grid structure which narrows or prevents the direct view of the LED lighting means from a certain angle. As a result, on the one hand, only slight impairment or attenuation of the intensity of light can be achieved and, on the other hand, an improved one Dazzling effect can be achieved for the user looking at the light outside this angle.

The optical disk is designed according to a further advantageous embodiment as a Fresnel lens. In this case, this Fresnelliπse be formed in the form of a film which is applied to the surface of the optical disk. Furthermore, it can alternatively be provided that a coating is applied which comprises the analogous effect as the glued-on foil. Furthermore, a volume or surface hologram may be applied to the foil.

Preferably, a coating of the optical disk of an organically modified ceramic, a so-called Ormocer, provided which can be structured by UV light. Such Ormocer coating can enable the holographic structure simply by exposure to UV light through a suitably formed mask. These Ormocere also have the advantage that they not only structure the surface of the cover plate, but also seal. As a result, scratch-resistant coatings can be produced.

According to a further advantageous embodiment of the invention it is provided that the optical disk is a part of the cover, that is, that the embodiment of the optical disk can also be provided directly on the cover. As a result, a component reduction can be achieved. This cover can thereby form a kind of secondary optics, which can additionally influence the room lighting in terms of color mixing, the beam angle and the focus. In particular, the design of holographic structures opens up universal possibilities for directing, mixing, fading out and focusing.

The housing for a luminaire, in particular for achieving a daylight-like spectrum with at least one group of colored LEDs and with at least one group of white LEDs which frame the colored LEDs, preferably has a housing which is designed as a base housing, on which different housing attachments assembled are animalizable. As a result, a base body is created, which can be made, for example, from an aluminum extruded profile. Various attachments for the respective Lichtstrahlfϋhrung can be flexibly provided on this body, so that a base lamp is provided whose functionality is adaptable to the required application.

Symmetrical or asymmetric reflectors are preferably provided as housing attachment. These thus allow various other geometrical configurations as well as adjustments to the purpose for the alignment of the light beam. For example, it can be provided in the embodiment of asymmetric reflectors that a light beam deflection of at least 30 ° takes place. In addition, depending on the deflection angle, it may still be possible for the LEDs themselves not to be visible and still for focusing.

According to a further preferred embodiment, it is provided that the housing has an integrated reflector, in particular a symmetrical light reflector. For example, specific light guides can be achieved thereby. At the same time the possibility is given, for example, to design the basic housing and the reflector as an extruded profile.

According to a preferred embodiment of the housing with integrated reflector is provided that two further additional reflector surfaces are mounted within the housing so that the radiation from a light module for the group of colored LEDs in a direct radiating portion and for the group of white LEDs in is divided over a double reflection radiating portion.

According to a further advantageous embodiment of the invention it is provided that the housing has a receiving space which is provided flush in a housing portion of the base housing and the receiving space forms a part of the outer housing wall. As a result, a particularly flat construction arrangement can be created, at the same time a simple integration and arrangement of a circuit board relate. As the light modules is possible. In particular, a circuit board forms part of the outer housing portion of the receiving space. As a result, a flat-built recessed luminaire or cassette light can be created, which includes, for example, a height of less than 10 mm.

According to a further advantageous embodiment of the invention it is provided that the receiving space is preferably filled within the housing above the board with a transparent plastic compound. As a result, an insulating effect is achieved at the same time. In addition, a good heat dissipation can be given in addition to the protection of the LEDs and possibly also the other electrical components components.

It is preferably provided that the strands of the LEDs located on the board and further electronic components are enclosed by a transparent plastic compound and an air gap between the transparent plastic plate and the cover of the housing remains. As a result, an insulating gap is formed, so that the cover does not heat up.

According to a further alternative embodiment of the invention, it is provided that the transparent plastic compound fills the receiving space within the housing section up to the upper edge of the housing, so that it forms part of the housing. The surface of the transparent plastic mass may preferably have an optical structure in analogy to the optical disk. This allows the cover to be omitted.

According to a further preferred embodiment of the invention, it is provided that at least one colored LED, at least one warm white or at least one cool white LED or any combination of the aforementioned LEDs are combined in an LED body. By combining the required LEDs in an LED body, the advantage is achieved that visually no single colored points of light can be seen, but the impression of a single point of light with the desired color temperature arises. In this case, the color active LED semiconductor components used are preferably combined in the power and / or number of the respective LED color so coordinated that the entire continuous spectrum in the visible range, as far as possible, extends linearly without distinct highs and lows.

To control a light, in particular to achieve a daylight-like light spectrum, the invention provides that over the course of each LED or strand of LEDs is supplied with power, so that the resulting light spectrum corresponds to the natural light spectrum substantially and that by several program steps for Activation after formation of the natural light spectrum, the LEDs, the strands or the strands of the LEDs are controlled such that two adjacent program steps have such a change in light intensity that this change is not visually visible. As a result, over an entire daily routine, starting from early morning until late in the evening, a continuous sequence can be achieved without the user actually realizing a change in the intensity, in particular during the transition of the individual program steps. Thus, this actually existing, but not noticeable to the user, visual change is very pleasant and the user does not realize the change in light color and light intensity. This has a positive effect on the sensation, since at the same time the daylight process is given and the user enjoys the advantages of this lighting.

According to a further preferred embodiment of the method, it is provided that the colored LEDs are driven with a lower power than the white LEDs. This results in a good equalization and superimposition of the spectral response, so that a respective supplement of the individual missing spectral ranges is made possible.

According to a further advantageous embodiment of the method, it is provided that the ratios of the power of the cold white and warm white LEDs are varied. As a result, for example, in the case of predominant activation of the warm-white LEDs, the morning and evening warm lighting mood can be generated. At midday, on the other hand, the cold white LEDs are increasingly activated. As a result of a continuous spectral course without significant peaks or valleys, the conditions are accordingly adapted to the course of the day.

According to a further advantageous embodiment of the method, it is provided that a control unit comprises a real-time clock and the individual program steps for generating the daylight-like light spectrum are controlled as a function of the real time. Thus, it may be possible that, if necessary, the light switched on and off and at any time the actual required light spectrum is output and generated according to the time of day.

According to a further advantageous embodiment of the method, it is provided that the lamp is supplied with a voltage between 90 V and 240 V. As a result, these luminaires can be used worldwide and retrofitted to existing systems.

A preferred embodiment of the method provides that the actual Lichtverhältπisse detected by at least one sensor and the resulting signals for controlling the light intensity of the LEDs are processed to achieve a daylight-like spectrum. This makes it possible, in particular in rooms that are illuminated in addition to artificial light by incident daylight, can be automatically adjusted to the actual prevailing daylight mood. This can be done, for example, in each program step, which is provided for the control of Lichtinteπsität. This can also be provided by a stored in its own program algorithm in the form of a closed loop. Also, the so-called fuzzy logic algorithms can be used in a simple manner. For example with a weather-related or collapsing darkness may further be selected automatically ^¬ a program step, which corresponds to the current time of day.

The invention as well as further advantageous embodiments and further developments thereof will be described below with reference to the drawings, in which gen illustrated examples described and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it :

FIG. 1 shows a schematic view of an LED arrangement of a luminaire according to the invention,

FIG. 2 is a schematic sectional view of the luminaire with housing according to FIG. 1,

FIG. 3 shows a schematic view of an alternative LED

Arrangement to FIG. 1,

FIG. 4 is a schematic sectional view of the LED

Arrangement of the luminaire in FIG. 3,

5 shows a schematic view of a further alternative LED arrangement to FIG. 1, FIG.

6 is a schematic sectional view of an alternative embodiment of the housing of a luminaire with the LED arrangement according to FIG. 5, FIG.

FIG. 7 shows a further schematic alternative embodiment of an LED arrangement to FIG. 1,

8 is a schematic sectional view of an alternative housing form of a luminaire with an LED arrangement according to FIG. 7, FIG.

9 is a schematic sectional view of a luminaire with an alternative housing to FIG. 2, FIG. Figure 10 is a schematic sectional view of another alternative embodiment of a lamp to Figure 2 and

11 is a schematic sectional view of an alternative housing shape of the luminaire to FIG. 2.

FIG. 1 shows a schematic view of a first embodiment of an arrangement of LEDs for a luminaire 11, which is provided in particular for achieving a daylight-like light spectrum. On a circuit board 12 is at least a first group 14 of colored LEDs 16, 17, 18 and a second group 19 of white LEDs 21 and 22. The first group 16 of the colored LEDs comprises an LED 16 with a wavelength of for example 490 nm to 510 nm with the color cyan, an LED 17 with a wavelength of 625 nm to 635 nm, which outputs the color red and an LED 18 with a wavelength of 590 nm to 605 nm, which outputs the color yellow-orange. For example, the first group of color LEDs may be composed such that an LED having a wavelength of 470 nm to 480 nm (blue), an LED having a wavelength of 490 nm to 510 nm (cyan), and an LED having a wavelength of 625 nm to 635 nm (red) is provided. Depending on the color gap to be filled and the actual wavelength of the individual colors, the colored group is compiled. This first group 14 of colored LEDs 16, 17, 18, for example, according to the illustrated embodiment six times in succession in a line or a row provided. The sequence of colored LEDs 16, 17 and 18 within the first group 14 remains the same and repeats. For example, the order of the colored LEDs 16, 17, 18 in the first group is provided such that the row starts with the color yellow-orange, ends with deep red and the color cyan is provided in between. Parallel to the first group 14 of LEDs 16, 17, 18, the further group 19 with warm-white LEDs 21 and cold-white LEDs 22 is arranged adjacent to left and right. Preferably, a series of warm white LEDs 21 is provided in parallel on both sides of the line of colored LEDs 16, 17, 18. These are, for example, the gap between two groups 14 of the colored LEDs 16, 17, 18 arranged. Furthermore, a line or row of cold-white LEDs 22 is also arranged in parallel outside the row of warm-white LEDs 21. These are in turn preferably arranged on the gap to the warm white LEDs 21. Such an arrangement allows a good mixing of the colored LEDs 16, 17, 18 with the white LEDs 21 and 22. In particular, these LEDs 16, 17, 18 have a wide radiation angle of for example 120 ° to 140 °, so that already immediately after Exit of the light radiation is a mixing. This can be done in a simple manner, a subsequent focusing by a secondary optics without other light modules 25 are required. The secondary optics can be given by reflectors, refractive or diffractive optics. Such optics are described below by way of example. The arrangement of the LEDs 16, 17, 18, 21 and 22 on the board 12, for example, represents a light module 25, which is provided independently for a lamp 11.

In the foreground of the first group of colored LEDs and their selection is that, in contrast to the RGB LEDs, the spectral range is not in the range of the photosensitive sensors of the eye, but in spectral ranges, which are only insufficiently represented by the white LEDs. Therefore, for example, a spectral range is selected from the colors cyan, yellow-orange and deep red. Alternatively, a spectral range of the colors cyan, red and blue can be selected. In addition, different warm and cold white LEDs are used together. For example, the cool white LEDs have a color temperature of around 6,000 ° K and the warm white LEDs have a color temperature of, for example, 3,500 ° K. The combination of the warm white and cold white LEDs makes it possible, by changing the ratio of the light output, in principle to produce a warmer or cooler lighting atmosphere. Since the white LEDs primarily depict the area of the sensitivity curve of the eye, usually sufficient pronounced spectra are missing in the yellow, red and also cyan spectral range. Therefore, the white ones are combined with colored LEDs that have their maximum spectrum just in the missing spectrum range of the white LEDs. This allows the realization of a uniform spectral profile. 2 shows a schematic sectional view of a first embodiment of a luminaire 11, which has the light module 25 according to FIG. This lamp 11 comprises a housing 27, which consists of a base housing 26 and a cover 28. In the base housing 26, a receiving space 29 is provided, in which the light module 25 is inserted. The light module 25 shown in FIG. 2 is a so-called master module. This master module comprises in addition to the first group 14 and second group 19 of LEDs 16 17, 18, 21, 22 at least one controller 31 and a power supply 32. The receiving space 29 is formed such that the board 12 flush with a rear wall of the housing 26 and the housing room rests and is included in this. Furthermore, the receiving space 29 is defined and bounded by wall portions 34 which extend from the side towards the center to form a screen for at least the controller 31 and power supply 32. Between the wall sections 34 there is a remaining free space in which the LEDs 16, 17, 18, 21 and 22 are located. The circuit board 12 opposite a cooling device 36 is provided outside the housing 27, which are formed for example as cooling fins.

In the present embodiment, the housing 27 and the base housing 26 is formed as an aluminum extruded profile and is tailored to the required length as needed. Alternatively, a plastic injection-molded part or extruded profile can also be provided. Such an arrangement shown in Figure 2 allows a flat-building unit and at the same time a good light scattering.

The circuit board 12 consists for example of good conducting aluminum or the like, on which the electronic components are applied in isolation. In addition, individual components for control and regulation can also be provided on the underside of the board. In this case, an insulating adhesive layer is preferably applied, so that an insulating arrangement of the arranged on the underside of the board components to the housing is made possible. The circuit board 12 can Preferably, they have a surface that is coated white or reflective, to prevent disturbing light absorption.

The cover 28 completely closes off the base housing 26, so that there is protection against contact with the LEDs 16, 17, 18, 21, 22. In a basic version, the cover is transparent. Between the receiving space 29 and the cover 28, an optical disk 37 may be provided, which initially fulfills various embodiments and functions and may also serve as a secondary optical system. For example, this plate 37 may comprise a reflective dot pattern. As a result, the direct glare is reduced, without the light output is significantly impaired. Alternatively, this plate 37 may have a surface with a fine reflective lattice structure, which has a similar effect as the reflector structures in conventional luminaires with fluorescent tubes. In addition, the surface can represent a diffractive optics. As a result, a focusing of the exiting light is achieved, which prevents glare from a certain angle. The diffractive optic is preferably designed as a hologram. These holographic structures can be surface-embossed or etched or formed as a film or photopolymer layer with a hologram. In particular, in such a holographic optics can even be achieved that from a certain angle, the cover plate appears dark and the light sources are visible only when you are directly in the light level.

Furthermore, this plate 37 may be formed as a Fresnel lens, which also causes a focus as a refractive optics. This Fresnel lens can also be formed by applying a coating or a foil.

Alternatively, the above embodiments, which may be provided on the optical disk 37, may be provided directly on an underside of the cover 28 or on the side of the cover 28 facing the LEDs or outside with the structured surface facing outwards. Likewise, individual grid structures, films or the like on the cover 28 and / or the plate 37 may be provided.

The control of the master module can be, for example, with a clamping ^¬ voltage of 110 V to 240 V. In addition, the master module has connections that allow so-called daughter modules to be connected to the master module, which can increase the performance of the luminaire without the need for additional power supply units. The control provided in the master module is designed such that the further LEDs of the daughter modules, which comprise exclusively LEDs, are activated. The LEDs of the same color are arranged both on the master module and on the daughter module in identical strands, that is, in the embodiment of Figure 1, for example, six LEDs 16 by one strand and six LEDs 17 and six LEDs 18 each by a further strand are interconnected. The same applies to the warm-white LEDs 21 and cold-white LEDs 22. All the LEDs of one color are electrically connected in series per strand. Each LED string preferably has its own power supply, which can be controlled independently of the other. This arrangement has the advantage that, for example, the centrally arranged colored LEDs 16, 17, 18 are outshined by the white LEDs 21, 22 surrounding them, thereby producing a good color mixture. The different number of warm-white and cold-white LEDs 21, 22 compensates for the effect that the warm-white LEDs are perceived visually weaker than the cold-white LEDs 22 even with the same radiation power.

FIG. 3 shows a schematic view of an alternative arrangement of LED lighting means to FIG. The circuit board 12 is for example circular. Near the center, for example, three colored LEDs 16 of the wavelength cyan are arranged. These are surrounded for example by the LEDs 18 with the wavelength deep red and are also on a circle. Furthermore, the colored LEDs 16 are surrounded by the colored LEDs 17 with yellow-orange, which also lie on a circle. The LEDs 17 are preferably provided in gap with the LEDs 18, and both LEDs are on one Circle or near two adjacent circles with very similar diameter.

Outside this first group 14 of the colored LEDs 16, 17, 18, the second group of white LEDs 21, 22 is arranged. For example, six warm white LEDs 21 and cold white LEDs 22 are preferably provided alternately on an outer ring, which surround the first group 14 of the colored LEDs 16, 17, 18. By twice the number of white LEDs 21, 22 with respect to the colored LEDs 16, 17, 18, wherein each color, for example, only three LEDs are provided, similar to the arrangement of Figure 1, a good homogenization of white and colored light components is achieved.

This application, which is equipped as a low power application, uses low voltage. Therefore, a kind of power supply is not required. The power supply is done in this embodiment, for example, by the pins 39, which can be plugged into the pin base of conventional halogen lights. These pins 39 are connected to the controller 31, which consist essentially of a rectifier, a capacitor for smoothing the DC voltage and so-called current sources. The power sources are in the simplest case, fixed resistors. The power sources are individually set per LED color so that the desired continuous color spectrum is emitted.

FIG. 4 shows a schematic sectional illustration of the light module 25 according to FIG. The arranged on the board 12 LEDs 16, 17, 18, 21, 22 are preferably covered together with the controller 31 by a transparent plastic compound 41 to protect these components during handling against damage. The arrangement of the pins 39, this board can be used in exchange for halogen lamps or halogen spots. In a larger application or design of a circuit board 12 and a larger number of LEDs, a radiator can be formed. In such a case, the controller and the power supply Adjustment 31, 32 adjusted accordingly. Such a lamp 11 can then be supplied with 220 V AC.

FIG. 5 shows a further alternative embodiment of a light module 25 of a luminaire 11. For example, the first group 14 of the LEDs 16, 17, 18 arranged as a triad in the form of an equilateral triangle, for example. This first group 14 is surrounded by the second group 19 of the LEDs 21, 22, the second group 19 having four LEDs 21, 22 which are arranged in a square. Two warm white LEDs 21 and cold white LEDs 22 are arranged diagonally opposite each other. The first and second groups 14, 19 of the LEDs 16, 17, 18, 21 and 22 form a small group 44. The arrangement of a plurality of small groups 44 in a raster format is connected by a row of warm white LEDs 21 and a column of cold white LEDs 22. The use of the warm white and cold white LEDs 21, 22 in the rows and columns may also be reversed. Preferably, the LEDs 21, 22 are arranged in the rows and columns in gap to the second group 19 of the LEDs 21, 22. By this arrangement and number of colored LEDs 16, 17, 18 and the warm white and cold white LEDs 21, 22, in turn, a good color mixing can be achieved.

FIG. 6 shows a schematic sectional representation of an alternative embodiment of a base housing 26 for a housing 27 of a luminaire 11 with at least one light module 25 according to FIG. The base housing 26 is formed for example as a frame profile. The board 12 receiving the LEDs can form a housing side of the base housing 26 and abuts against receiving sections 45 provided for this purpose. In this way, a good heat dissipation by radiation, Koπvektion or direct thermal contact with the environment can be made. In addition, a flat construction arrangement is thereby created. These lights 11 are also referred to as cassette lights, which preferably have a square or rectangular base. The light module 25 is in turn covered with a transparent plastic compound 41, so that the components are protected. It is provided that in the area of the LEDs 16, 17, 18, 21, 22, the plastic mass 41 remains transparent and in the region of the controller 31 and power supply 32, a print or an insert 47 is provided, which is not transparent. As a result, these components of the controller 31 and power supply 32 remain hidden and are not visible. As an alternative to the transparent plastic compound 41, a transparent cover may also be provided. Alternatively, the control and power supply may also be provided spatially separated from the housing 26 of the luminaire 11. The corresponding signals and the power supply then takes place via a connecting cable.

FIG. 7 shows a further schematic view of a light module 25 for a luminaire 11. In this arrangement of the LED lighting means is provided that a first group 14 of colored LEDs 16, 17, 18 is arranged in a row or line. Also in the same row or line, the second group 19 of LEDs 21 and 22 is provided, this framing the first group 14 of the LEDs 16, 17, 18. In addition, the second group 19 comprises, for example, another warm-white or cold-white LED 21, 22. All these LEDs 16, 17, 18, 21, 22 are provided in a row or on the same line. This results, for example, in an arrangement starting with a cold-white LED 22 and a warm-white LED 21 of the second group 19, which follow the LEDs 18, 16, 17 of the first group in the order red, cyan, yellow-orange. Then a cool white LED 22 connects. This order can be repeated several times. The arrangement of the colored LEDs 18, 16, 17 can optionally be done differently. The proposed arrangement has in particular a homogeneity in the color mixture. Preferably almost twice as many warm white LEDs 21 are provided as cold white LEDs 22 in order to realize the realization of a daylight spectrum with a focus on a predominantly warm daily routine of the spectrum, especially for Central Europe. Near the equator, a cooler mixture of light is needed. The number of warm white and cold white LEDs 21, 22 is reversed. FIG. 8 shows a schematic sectional illustration of a base housing 26 for an alternative embodiment of the luminaire 11. The design of the luminaire 11 is adapted in particular to a light module 25 according to FIG. The base housing 26 has symmetrically formed reflectors 51, which extend from the receiving space 29. In addition, this lamp 11 further includes reflector profiles 52, 53, which are arranged in mirror image to each other. These reflector profiles 52, 53 are aligned, for example, V-shaped and have a central outlet gap, which forms a directly radiating portion of the generated radiation. Between the respective reflector profiles 52, 53 and the reflectors 51 there is a double reflection of the light rays.

This arrangement and embodiment of the luminaire 11 is particularly advantageous for the light module 25 according to FIG. 7. The reflectors 51 preferably directly adjoin the receiving space 29 of the base housing 26, wherein the receiving space 29 is configured such that the control and power supply 31, 32 within arranged in the receiving space 29 and thus is not visible.

FIG. 9 shows a further alternative embodiment of the luminaire 11. This luminaire 11 comprises a housing 27, which is formed from a base housing 26 and an attachment housing 59 arranged thereon, which is fastened to the base housing 26 via connection points 61. The base housing 26 corresponds to that in Figure 2. The attached thereto attachment housing 59 is preferably also formed as an aluminum extruded profile and releasably secured by a screw, clamp connection or the like. The reflectors 51 in the attachment housing 59 preferably extend in turn to the board 12 in such a way that there is a visual protection with respect to the components of the controller 31 and the power supply 32 lying adjacent to the LEDs 16, 17, 18, 21, 22. Alternatively, the attachment housing 59 and the base housing 26 may also be integrally formed. Incidentally, reference may be made to the above alternative embodiments, which are also possible with this lamp 11. FIG. 10 shows an alternative embodiment of the luminaire 11 to FIG. 9. The attachment housing 59 is formed asymmetrically instead of the symmetrical configuration in FIG. For this purpose, in turn, an aluminum extruded profile can be provided. The inner surface of the attachment housing 59 in turn comprises reflectors 51, which extend to the receiving space 29, so that the components for the controller 31 and the power supply 32 are hidden again. This attachment housing 59 may alternatively be made as a metal or plastic injection molded part. Further advantageous embodiments and variants of the above lights 11 and light modules 25 are also eiπsetzbar here.

FIG. 11 shows a further alternative embodiment of a luminaire 11, which is suitable in particular for installation in solid angles. In this embodiment, the base housing 26 is formed as a triangle, in particular as an isosceles triangle. The circuit board 12 may be arranged, for example, at a right angle to the cover 28, which is aligned diagonally to the corner. In this embodiment, for example, only one reflector surface 51 is provided to guide the light radiation to exit via the cover 28.

The inventive design of light modules 25, in particular as master modules and daughter modules, a flexible design and a flexible structure of such lights can be made possible. In addition, this arrangement allows a simple replacement of previous lighting systems by the new light 11 or lights 11 according to the invention, maintaining the full functionality of the previous installation and improving the quality of light. This can be done in the following way: To connect the lamp 11 of the invention, the existing power cord can be used. An adapter is used close to the central light switch, which modulates the switching signal of the existing control element and possibly other control data on the existing power line. Alternatively, instead of the existing light switch without further installation, a comfortable operating system can be used, which has additional Bedienfunkti- oneπ and possibly also sensor signals and values of a Integrates real-time clock in the control signals and sends over the adapter and the power supply to the light 11. On the master module of the lamp 11, the control signals are coupled out of the power line and evaluated for driving the LEDs 16, 17, 18, 21, 22 and forwarded. The control signals are then used to control the power supply or the strands of the individual LEDs 16, 17, 18, 21, 22 in the form of a current control. The individual LED strings are then driven by the currents of the associated power supply. This happens first with the LEDs, which are located on the master module. The power supply is accordingly designed so that, without any further change to each LED string of the master module, further LEDs can be added in series, as is easily possible due to the daughter modules.

For daylight-dependent control of the luminaires according to the invention, it is provided that, for example, over twelve hours, a plurality of program steps, for example 64 program steps, are used, wherein at a fixed start time early in the morning the individual program steps are switched consecutively starting at regular intervals. This results in a visually continuous process in the change of the radiation intensity and the spectral course, wherein the spectral difference between two successive program steps is selected such that a visual difference can not be detected by the human eye. This gives the user the impression that there is a continuous change, as is the case with natural daylighting. In the individual program steps, the associated power level is stored for each LED string, so that the required light spectrum is controlled accordingly.

The luminaire is preferably provided with a real-time clock, so that the associated program level is controlled according to the current time of day. Furthermore, it can preferably be provided that sensors are integrated into the controller 31 of the lights 11 or provided separately and connected to the controller 31.

Claims

claims

1. Light, in particular for achieving a daylight-like light spectrum, with a plurality of LED bulbs receiving board (12), wherein at least one white LED and at least one colored LED are provided as LED bulbs, characterized in that to achieve a uniform, the Sunlight in the visible range comparable spectral course a predetermined number of colored and white LEDs (16, 17, 18, 21, 22), a predetermined combination of the arrangement of the colored and white LEDs (16, 17, 18, 21, 22) and a predetermined Power control of each LED (16, 17, 18, 21, 22) is provided.

2. Lamp, in particular according to the preamble of claim 1, characterized in that at least one first group (14) of colored LEDs (16, 17, 18) of different spectral colors is provided, which of at least one second group (19) with white LEDs (21, 22) is framed, or that to obtain a continuous, sunlight-like spectral response in the visible range, one or more groups of such colored LEDs (16, 17, 18) are combined with the white LEDs (21, 22) the wavelengths of the colored LEDs (16, 17, 18) spectrally weak trained wavelength ranges of the white LEDs (21, 22) largely compensate and extend the overall spectral course of the combined light spectrum in the direction of short and long wavelength ranges.

3. Lamp according to claim 1, characterized in that the LEDs (16, 17, 18, 21, 22) are formed with a wide beam angle.

4. Luminaire according to one of the preceding claims, characterized in that the at least one first group (14) of the colored LEDs (17, 18, 19) of at least one LED (16) having a wavelength of 490 nm to 510 nm (cyan) , at least one LED (17) with a wavelength of 625 nm to 635 nm (red) and out at least one LED (18) with a wavelength of 590 nm to 605 πm (yellow-orange) consists.

5. Luminaire according to claim 1 to 3, characterized in that the at least one first group (14) of the colored LEDs (17, 18, 19) of at least one LED (16) having a wavelength of 470 nm to 480 nm (blue) , at least one LED (17) having a wavelength of 490 nm to 510 nm (cyan) and an LED (18) having a wavelength of 625 nm to 635 nm (red).

6. Lamp according to claim 1, characterized in that the at least one second group (19) of white LEDs (21, 22) at least one warm white LED (21) having a color temperature of 3000 K to 4000 K and at least one cool white LED (22 ) with a color temperature of 5,400 K to 6,500 K.

7. Lamp according to one of the preceding claims, characterized in that the light output of the white LEDs (21, 22) is a multiple of the light output of the colored LEDs (16, 17, 18).

8. Light according to one of the preceding claims, characterized in that the LEDs (16, 17, 18) with the colors cyan, yellow-orange and deep red form the first group (14), wherein the colored LEDs (16, 17, 18 ) are arranged in a row one behind the other and that at least two first groups of the colored LEDs (16, 17, 18) are provided on a line one behind the other and left and right adjacent to the line of the at least two groups (14) of colored LEDs (16, 17 , 18) at least a second group (19) of white LEDs (21, 22) is provided.

9. Lamp according to claim 8, characterized in that the second group (19) of the white LEDs (21, 22) has an arrangement in which a line provided with warm white LEDs (21) and another line with cool white LEDs (22) is, which are each spaced parallel to each other and preferably offset from one another in space.

10. Lamp according to claim 9, characterized in that the warm white LEDs (21) between the at least one first group (14) of the colored LEDs (16, 17, 18) and the line with cool white LEDs (22) are provided.

11. Luminaire according to one of claims 7 to 9, characterized in that the first group (14) with colored LEDs (16, 17, 18) has a fixed sequence of colored LEDs (16, 17, 18) to each other, preferably the Order yellow-orange, cyan and deep red includes, and that the juxtaposition of several first groups (14) is provided in the same color order.

12. Light according to one of claims 1 to 7, characterized in ^¬ net, that the colored LEDs (16, 17, 18) of the first group (14) and the white LEDs (21, 22) of the second group (19) arranged in a circle are, wherein the second group (19) of the white LEDs (21, 22) surrounds the first group (14) of the colored LEDs (16, 17, 18).

13. Luminaire according to claim 11, characterized in that at least three circles each formed by a color of the colored LEDs (16, 17, 18) and at least one circle each with warm white LEDs (21) and cold white LEDs (22) is provided.

14. Luminaire according to claim 13, characterized in that the warm white and cold white LEDs (21, 22) are offset and positioned on a gap to each other.

15. Luminaire according to claim 13 or 14, characterized in that a circular formed board (12) has connecting pins (39) which are provided for contacting and receiving the power supply (32).

16. Luminaire according to claim 1 to 7, characterized in that the first group (14) of colored LEDs (16, 17, 18) and the second group (19) of white LEDs (21, 22) on a common Li are never arranged one behind the other and the first group (14) of colored LEDs (16, 17, 18) is provided between the second group (19) of white LEDs (21, 22).

17. Luminaire according to claim 16, characterized in that the first group (14) of the colored LEDs (16, 17, 18) of two warm white or two cold white LEDs (21, 22) is framed and at one end of the row of LEDs ( 21, 22) of the second group (19) one or more cool white or warm white LEDs (21, 22) are additionally provided.

18. Luminaire according to one of claims 1 to I _1, characterized in that a group (14) of colored LEDs (16, 17, 18) of a group (19) of white LEDs (21, 22) is surrounded, which is a square Arrangement and together form a small group (44), that a plurality of small groups (44) are arranged grid-shaped to each other in columns formed between the small groups (44) cold white LEDs (22) and in between the small groups (44) lines warm white LEDs (21 ) are provided.

19. Luminaire according to claim 18, characterized in that the warm white LEDs (21) and the cold white LEDs (22) of the rows and columns offset from the square arrangement of the second group (19) of white LEDs (21, 22) are provided.

20. Luminaire according to claim 18 or 19, characterized in that the square arrangement of the second group (14) of white LEDs (21, 22) each have two warm white and two cool white LEDs (21, 22), which are arranged diagonally opposite each other ,

21. Luminaire according to claim 1, characterized in that at least two LEDs (16, 17, 18) of the same color form a strand and the strand forming LEDs (16, 17, 18) are connected in series.

22. Luminaire according to claim 1, characterized in that at least two warm white LEDs (21) and at least two cool white LEDs (22) form a strand and the strand forming LEDs (21, 22) are connected in series.

23. Luminaire according to claim 21 and 22, characterized in that on the board (12) at least one light module (25) is provided, which consists of one strand of colored LEDs (16, 17, 18) and at least one strand of the warm white and cold white LEDs (21, 22).

24. Luminaire according to claim 19 to 23, characterized in that each strand of at least two LEDs (16, 17, 18, 21, 22) is controlled independently of the other strand.

25. Luminaire according to claim 23, characterized in that a plurality of strands are electrically connected in series.

26. Luminaire according to claim 23 to 25, characterized in that all electrically connected in series strands with the same control (31) and power supply (32) are controllable.

27. Luminaire according to one of claims 23 to 26, characterized in that at least one light module (25) and a controller (31) and power supply (32) are provided on a common board (12) and this arrangement forms a master module.

28. Luminaire according to claim 23 to 26, characterized in that a plurality of strands, each having at least one LED as a light module (25) on a common board (12) are combined and these arrangements form a subsidiary module.

29. Luminaire according to claim 27 and 28, characterized in that one or more daughter modules to a master module preferably in series connectable and can be controlled by the master module.

30. Luminaire, in particular according to claim 1, with a housing (27), characterized in that the housing (27) has a receiving space (29) for at least one printed circuit board (12) with at least one group (14) of colored LEDs ( 16, 17, 18), at least one group (19) of white LEDs (21, 22) and at least one controller (31) and power supply (32), wherein the receiving space (29) by wall sections (34) is limited, so that from the outside only the groups of colored and white LEDs (16, 17, 18, 20, 21) are visible.

31. Luminaire according to claim 30, characterized in that the housing (22) has a transparent cover (28) which covers the receiving space (29), and that the transparent cover (28) associated with and to the receiving space (29) pointing preferably one optical disc (37) is provided.

32. Luminaire according to claim 31, characterized in that the optical plate (37) has a diffractive structure for focusing or light scattering of the light radiation.

33. Luminaire according to claim 31, characterized in that the optical plate (37) has a grid structure which narrows or prevents the direct view of the LEDs (16, 17, 18, 21, 22) from an oblique angle.

34. Luminaire according to claim 31, characterized in that the optical plate (37) is designed as a Fresnel lens.

35. Luminaire according to claim 31 to 34, characterized in that the optical plate (37) for forming an optical structure has a coating or a glued or welded-on film.

36. Luminaire according to claim 35, characterized in that the glued or welded-on foil or applied photopolymer layer has a volume or surface hologram.

37. Luminaire according to claim 35, characterized in that the coating consists of an organically modified ceramic, in particular an Ormocer, which is structurable by UV light.

38. A luminaire according to claim 31, characterized in that the optical plate (37) is a part of the cover.

39. Luminaire according to claim 30, characterized in that the housing (27) as a base housing (26) and an attachment housing (59) can be mounted.

40. Lamp according to claim 39, characterized in that the attachment housing (59) has symmetrical or asymmetrical reflectors (51).

41. Lamp according to claim 30, characterized in that the housing (27) is formed asymmetrically for indirect light irradiation.

42. Luminaire according to claim 30, characterized in that the housing (27) is formed with an integrated symmetrical reflector (51).

43. Luminaire according to claim 42, characterized in that within the housing (27) two further reflector profiles (52, 53) are provided such that a radiation of at least one light module (25), wherein the LEDs (16, 17, 18th , 21, 22) are arranged in series one behind the other, divided into a directly emitting partial area and into a further partial area emitting via double reflections.

44. Luminaire according to claim 30, characterized in that the at least one circuit board (12) is provided flush with an outer housing portion of the base housing (27) in the receiving space and forms part of the outer housing wall.

45. Luminaire according to one of claims 30 to 44, characterized in that the receiving space (29) of the housing, in which the at least one circuit board (12) is arranged, is filled with a transparent plastic compound and preferably on the board (12). located LEDs (16, 17, 18, 21, 22) and the controller (31) and power supply (32) are completely enclosed by the transparent plastic compound (41).

46. Luminaire according to claim 45, characterized in that the receiving space (29) is filled with the transparent plastic compound such that an air gap between the transparent plastic mass (41) and the cover (28) of the housing (27) is provided.

47. Luminaire according to claim 45, characterized in that the transparent plastic compound (41) fills the receiving space (29) up to the upper edge of the housing (27), so that the plastic compound is a part of the housing (27), in particular the cover (28 ) forms.

48. Luminaire according to claim 45 or 47, characterized in that the surface of the transparent plastic compound (41) has an optical structure.

49. Luminaire according to one of the preceding claims, characterized in that at least one colored LED (16, 17, 18), at least one warm white or at least one cool white LED (21, 22) or a combination of the LEDs (16, 17, 18, 21, 22) are combined in an LED body.

50. A method for simulating a spectral daylight process with a lamp (11), in particular according to one of claims 1 to 46, to obtain a daylight-like spectrum, wherein at least a first group (14) of colored LEDs (16, 17, 18) and at least a second group (19) of white LEDs (21, 22) are arranged on a circuit board (12) and by a controller (31) are driven, characterized in that over the course of each LED (16, 17, 18, 21, 22) is supplied with power such that the resulting light spectrum corresponds to the natural light spectrum and that by several program steps for driving and reproduction of the natural light spectrum, the LEDs (16, 17, 18, 21, 22) are driven in such a way that two successive program steps have such a change in the light intensity and the light spectrum, which are not visually visible.

51. The method according to claim 50, characterized in that the colored LEDs (16, 17, 18) are driven with a lower power than the white LEDs (21, 22).

52. The method according to claim 50, characterized in that the ratios of the power of the cold white and warm white LEDs (21, 22) are varied.

53. The method according to claim 50, characterized in that the controller (31) comprises a real-time clock and the individual associated program viewing stages are controlled to generate the natural light spectrum as a function of the real time.

54. The method according to any one of claims 50 to 53, characterized in that the lamp (11) is supplied with a voltage between 90 V and 240 V.

55. The method according to claim 50, characterized in that the actual light conditions are detected by at least one sensor and the detected signals of the at least one sensor to the controller for controlling the light intensity of the LEDs (16, 17, 18, 21, 22) for generating a daylight-like spectrum depending on the actual light are forwarded.