HID, High intensity discharger, is the upgraded lighting system for your original halogen headlight, it comes with many decent features compared to the halogen lights. The main advantages are the high light intensity provided by the HID lamps and a low power consumption. HID headlights are getting more and more popular for automotive car headlight system, most of the new car models are equipped with the HID headlights, and it seems that the they will keep replacing the original halogen lights in the future. http://www.xtremehids.com/