An LED signal using a novel optical element to control the light distribution of a small LED light source. Light emitted by the LEDs illuminates the optical element. The optical element has a plurality of clusters, shaped along the x-, y- and z-axis to control the light. After the light is distributed,...http://www.google.fr/patents/US7237924?utm_source=gb-gplus-shareBrevet US7237924 - LED signal lamp
