The front fog light is a high-brightness scattered light source. The intensity of this light source is to penetrate the thick fog and play a role in reminding the driver in the opposite direction. Although the headlight technology of the car has been innovating, the fog lamp has always been used Halogen light source, this is because the color temperature of the halogen light source is low and the penetrating power is strong, so it is very necessary to turn on the fog lamp in foggy days.