A simple upgrade that can increase safety and looks of a vehicle are projector head lights and in turn HID lights. The difference between HID lights and Halogen lights is the way they burn, to light up. An HID light will make an arc between two electrodes, while a Halogen light will heat up filament within a gas filled glass. In most cases HID lighting is more efficient, brighter, and thus safer to use on vehicles to see better in the dark.
When buying projector headlights do not assume that you are getting HID lights. Often times cheap projector head lights are made to use halogen bulbs, instead of the brighter, more intense HID. The bulbs are generally not interchangable and require an actual kit to get HID lighting out of a traditional halogen bulb setup. If HID bulbs are used, then melting of the lens and housing is possible.
Before buying projector headlights, for the HID upgrade, make sure that HID bulbs will work in the new headlights you are buying.
High End Vehicle Use
Generally just because headlights on a vehicle are bright, does not mean that they are HID. High end vehicle manufacturers like Ferrari, Porsche, and Lexus are the only vehicles that have stock HID lighting. Any other mas produced mid range vehicle will require a HID kit to replace the halogen stock head lamp assembly.
This has been a post into a series of articles on explaining entry level questions to automotive enthusiasts. There are greater details of differences that can be found on HID and Halogen lighting via Wikipedia.
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