How led has evolved:
By allah3
@allah3 (171)
India
August 22, 2007 10:59am CST
The first LED's bright enough for use in outdoor applications made of aluminium-gallium arsenide.These red LED's appeared as high-mount stop lights on automobiles and in a limited number of traffic lights..The recent advent of efficient green,blue,and white LED's may lead to more application..
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