First, the light efficiency of LED has reached 120 Lm/W, which exceeds the typical value of energy-saving lamps. It will make the led one of the most efficient light sources. Secondly, the power LED has unidirectional radiation characteristics. Most of the light energy emitted by the lamp can reach the illuminated object directly without reflection, so that the light energy can be emitted to the maximum extent and the efficiency of the lamp is greatly improved. LED has a long life and is environmentally friendly. At present, the average trouble-free working time of purchasable power LED is more than 50,000 hours; if it works 12 hours a day, it can be used for 10 years. Its waste can be recycled almost entirely. This not only saves energy, but also saves resources and protects the environment. When other light sources are discarded, the environment will be polluted. Especially when fluorescent lamps are discarded, the mercury in the lamps will cause serious pollution to the environment and water sources.