In our cars today, there are many kinds of light sources, halogen lamps, xenon lamps, LED lamps, these are more common, and even laser headlights, among them, halogen lamps are the earliest and the most widely used. Used in low-end models, or low-end models of a certain car series, while xenon lamps and LED lights are generally used in mid-to-high-end models, especially in the past two years, the application of LED lights has become popular. Small, medium and low-end models have also begun to be equipped. Led lights have gradually entered the public's field of vision, and LED lights that are usually only seen on household appliances can also be seen in many cars.