The biggest advantage of led lamps is energy saving and durability. Energy saving is the essential characteristics of LED chips. Durability is mainly the control of light decay. The key factor affecting light decay is: first of all, the chip is itself. The price is low; followed by constant current driving, the LED lamp is very sensitive to the light emitting diode chip heating. Constant current driving can be used to control the chip heating degree, and the heating can be controlled to control the light decay. The packaging process has high heat dissipation requirements, and the manufacturing process is also very important. The above three factors have achieved the quality of the LED and also determined its high price, the so-called 'high quality and high price, low price and high light attenuation'.