High intensity discharge (HID) lights are known for their high luminous efficacy, meaning their ability to produce lots of light at proportionally low amounts of wattage. HIDs function by sending electrical current through a filament and exciting the gas inside the glass envelope, thus producing an electrical arc. HIDs are typically filled with a noble gas (argon, krypton, xenon, and neon) and another gas, most often sodium, metal halides, or Mercury.
No, there are no such things as "hid lights".
The older BMWs do not have HID lights
No, generaly the car lights cums with elargins if we want HID lights we can install...it
Yes, HID lights need a ballast.
Yes.
Depends, HID KITS are not legal anywhere in the US, they violate US DOT law. HID lights that come factory with a proper projector designed with HID in mind (higher end cars; Audi, Mercedes). Practically, if you aim the HID lights down, as to not blind other drivers, its unlikely that a cop will pull you over, as they can't really tell if your lights stock or an addon kit.
Aftermarket HID's are illegal in ANY state. Period.
There is definitely a way to make your HID lights brighter. To make your HID lights brighter, you can purchase and install xenon projectors or specifically designed reflectors. You also have the choice of upgrading your reflectors to halogen headlamps to make them even brighter.
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There are four types of HID lights Metal Halide, High/Low Pressure Sodium, Mercury Vapour, Zenon. Common uses include Street lighting, car head lights, sports field lighting, fish tank lighting. HID stands for high intensity discharge.