LED as a new type of green products, it must be the future trend of the 21st century will enter the new era of LED lighting as the representative .
LED belongs to the whole solid cold light source , smaller , lighter , more robust construction and low operating voltage , practical and long life . According to the usual definition of luminous efficiency , LED luminous efficiency is not high , but because of the LED spectrum almost all concentrated in the visible light spectrum , the efficiency up to 80 % to 90 %. The visible efficiency equivalent incandescent light efficiency of only 10 % to 20% , single LED power is generally 0.05 ~ 1W, to meet the different needs through the cluster approach .


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