There is provided yellow and red illumination systems, including a semiconductor light emitter, and a luminescent material. The systems have an emission falling within the respective ITE red and yellow color bins having specified color coordinates on the CIE chromaticity diagram. The luminescent material...http://www.google.com/patents/US20070114562?utm_source=gb-gplus-sharePatent US20070114562 - Red and yellow phosphor-converted LEDs for signal applications
