Hid stands for high intensity discharge, here we mean hid auto xenon lamps.The xenon lamp consists of two parts.One is for small quartz (figure 1) bulbs with inert gases and rare metal, and the other is power ballast (figure 2).After electricity connected, the ballast could increase the power supply from 12v to 23000-pulse voltage.By this process, the inert gases in the quartz bulbs could emanate 4200-8000k color temperature lights, which provide the users a favorable light environmen.