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LED uses solid semi-conductor as lightening materials. It has many advantages such as high lightening efficiency, low power consumption, long life-span, security, quick response, environment-friendly, low operation temperature, etc. Under the same brightness condition, the power consumption is as much as 1/10 of incandescent lamp, 20 times of fluorescent lamp, but the life-span is as long as 50 times of incandescent lamp, 20times of fluorescent lamp. So it is trend that LED light will instead of conventional lights.