LED is known as the fourth generation of lighting source or green light source, with the characteristics of energy saving, environmental protection, long life, small size and so on. It is widely used in various fields such as indication, display, decoration, backlight, general lighting and urban night scene. According to the different functions, it can be divided into five categories: information display, signal lamp, vehicle lamps, LCD backlight and general lighting.

The conventional LED lamp has some defects such as insufficient brightness, which leads to insufficient popularity. The power LED has the advantages of sufficient brightness and long service life, but the power LED has the technical difficulties of packaging. The following is a brief analysis of the factors that affect the lighting efficiency of power LED packaging：

1.Heat dissipation technology

2.Selection of filler

3.Reflection processing

4.Phosphor selection and coating