A lighting device having a plurality of high flux LEDs mounted on a heat sink and surrounded by a diffuser and a power supply that provides independent power to individual sets of the LEDs. The heat sink serves to transfer heat from the LEDs to the outside environment. In one embodiment the lighting...http://www.google.fr/patents/US7217006?utm_source=gb-gplus-shareBrevet US7217006 - Variation of power levels within an LED array
