In various embodiments of the invention, a unique construction for Light Emitting Diodes (LEDs) with at least one luminescent rod and extracting optical elements used to generate a variety of high brightness light sources with different emission spectra. In an embodiment of the invention, forced air...http://www.google.de/patents/US8098375?utm_source=gb-gplus-sharePatent US8098375 - Light emitting diode illumination system
