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LED (Light Emitting Diode) is an environmentally friendly light source for lighting in the new generation of the 21st century. LED not only comprises the concept of energy saving, but also has advantages such as long lifetime, durable, without heat in the light source and without UV. According to market information, in US, the proportion of luminaries to total power consumption is 20%, while the proportion in China is 15%. If the 28 million high pressure sodium streetlamps in China are replaced by high efficiency LED streetlamps, an amount of RMB 58 billion of electricity and maintenance fee can be saved every year. Furthermore, the pollution to air and the earth arising from the discharges of harmful substances like carbon dioxide can be effectively decreased. The use of non-renewable energy can be decreased as well, and be good for the protection of ecology and the earth.