zhangkai fa For general lighting speaking, people need more white light source. 1998 years of successful development LED to send the white light. This LED corn light to GaN chip and is yttrium aluminum garnet (YAG) package together make it. GaN chip hair blu-ray (lambda p = 465 nm, Wd = 30 nm), high temperature sintering of the Ce3 + : by this excited phosphor blu-ray a yellow led corn light, peak 550 nm. Blue LED substrate installation in the bowl reflection cavity, cover image with mixed with a thin layer of resin:, about 200 500 nm. LED warehouse light by a blu-ray part substrate phosphor absorption, the other part of blue and a yellow phosphor mix, can get to white light. Now, for InGaN/YAG white LED warehouse light, by changing the chemical composition of phosphor YAG and adjust the phosphor layer thickness, can obtain color temperature 3500-10000 K of of all kinds of white light. This through the method of white light blue LED get, simple structure, low cost, high technology and the maturity, so use most.