They use xenon gas bulbs. These are a form of halogen lighting.
HID headlights are far more brighter than normal Halogen bulbs that are normally in headlights. HID are often thought of as safer because they have a blue glow to them and resemble daylight more than normal bulbs.
A HID D1S bulb is a type of high-intensity discharge (HID) lighting used primarily in automotive headlights. It features a xenon gas-filled arc tube that produces a bright, white light when an electrical current passes through it. D1S bulbs are known for their efficiency and longevity compared to traditional halogen bulbs, providing improved visibility and a modern aesthetic. They are typically used in vehicles equipped with projector-style headlights.
of course
A Honda Civic coupe has 9003 headlight bulbs
HID stands for High Intensity Discharge. It uses high voltages to create an arc of electricity in a special mixture of gasses and metals to create a powerful bright light that is normally whiter than halogen bulbs. As there is no filament, bulb life is usually longer than equivalent halogen bulbs. They are used as headlights on some high end-cars and are an added-cost option on some vehicles. Factory fitted HID lights usually come with a washing system and self-levelling. Aftermarket HID lights can be added to most vehicles that converts them to HID bulbs. This requires replacement bulbs and a ballast unit to generate the voltages required. They are popular with car modification enthusiasts, off-road drivers and motorcycles with poor factory- standard single headlights.
HID headlights refer to high definition headlights. These are headlights that use LED lightbulbs in them so drivers can see clearer and farther ahead in the dark.
Halogen headlamps must use halogen bulbs. "HID kits" are widely available, but they are (all) unsafe and illegal.
You could find information about hid headlights on Wikipedia, at http://en.wikipedia.org/wiki/Headlamp. Hid headlights are usually attached to the front of a vehicle like a car or motorcycle.
...If they're hid, what difference does it make?
If you're smart, you don't. So-called "HID kits" to convert halogen headlamps are widely available, but they are (all) illegal and dangerous; halogen headlamps must use halogen bulbs.
Headlamps originally designed, built, tested, and certified as HID headlamps are legal in all 50 states. So-called "HID kits" to convert halogen headlamps are widely available, but they are (all) illegal and dangerous; halogen headlamps must use halogen bulbs.
Headlamps originally designed, built, tested, and certified as HID headlamps are legal in all 50 states. So-called "HID kits" to convert halogen headlamps are widely available, but they are (all) illegal and dangerous; halogen headlamps must use halogen bulbs.