There is provided a white light illumination system including a blue LED and a luminescent material. The system color output is improved when a line connecting the LED color coordinates and the luminescent material color coordinates approximates the Black Body Locus on the CIE chromatically diagram....http://www.google.ca/patents/US6538371?utm_source=gb-gplus-sharePatent US6538371 - White light illumination system with improved color output
