High intensity discharge bulbs contain a mixture of gases and rare metals that are heated to generate a bright white (or blue) glow which legislators have stipulated all new cars must illuminate. Not only do they produce white light this white light has a blue hue to it which adds to the aesthetic beauty of your car.
HID’s are roughly two to three times brighter than the standard halogen bulbs about 3000 Lumen compared to 1400 produced from Halogen bulbs and as a result, has led to complaints about the level of glare these lamps produce.
This increases vision which increases reaction time to unforeseen obstacles making driving safer at night.
HID lamps actually require more power to start up but once they are on they operate at a much lower power usage than Halogen. Drawing only about 35 watts of power, they generally are good for about 2000 hours of life. This makes HID lights more efficient than halogen.