According to this invention, a side-emitting illumination device for uniformly distributing light is composed of an LED light source, a light-transmitting rod which permits total internal reflection, and outcoupling material affixed to an outer surface of the rod. Light enters the rod at one end and...http://www.google.fr/patents/US6783269?utm_source=gb-gplus-shareBrevet US6783269 - Side-emitting rod for use with an LED-based light engine
Side-emitting rod for use with an LED-based light engine
