The initial LED used as instrumentation indicator light source
and later a variety of light color LED traffic lights and large area display has been widely used, resulting in a very good economic and social benefits. To 12-inch red traffic lights, for example, in the United States was originally used long life, low luminous efficiency of 140 watts incandescent light as a light source, which produces 2000 lumens of white light.
After the red filter, the light loss of 90%
leaving only 200 lumens of red light. In the newly designed lights, Lumileds uses 18 red LED light sources, including circuit losses, including a total of 14 watts of power consumption, can produce the same light effect.Gram lights are also important areas of LED light source applications.
For general lighting, people need a white light source
1998 white LED development success. This LED is the GaN chip and yttrium aluminum garnet (YAG) made together. GaN chip with blue light (λp = 465nm, Wd = 30nm), high temperature sintered Ce3 + -based YAG phosphor was excited by this blue light emitted after the yellow light, the peak 550nm. The blue LED substrate is mounted in a bowl-shaped reflective cavity, covered with a thin layer of resin mixed with YAG, about 200-500 nm
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