jdub is correct.
Halogen = standard car headlight
Halogen/Xenon = bright white/cool blue/HID-looking headlights on hondas (like mine) for $20
HID = fancy BMWs, Audi's, Lexii, Acuras...
When HID technology came to cars, that is the same time that halogen/xenon technology came to cars. and since xenon is designed for HID-look (higher temp/kelvin light) there is a lot of confusion.
HID does NOT equal XENON. A lot of people think they are the same, but it is b/c the term xenon has been using incorrectly for years.
read:
http://www.coolbulbs.com/faq.asp
excerpt talking about cool white/xenon halogen lights:
Quote:
Our Nokya Arctic White bulbs produce about 5000°K and our Arctic Purple bulbs are about 7000°K the difference is huge.
This increase was achieved two ways, first these bulbs use a more tightly wound spiral filament made of finer wire in a precise mixture of halogen and xenon gasses that is under much higher pressure than a normal halogen bulb. The presence of xenon gas under high pressure provides an increased rate of halogen regeneration resulting in a very intense light. Depending on the design, a 55-watt version of this type of bulb can produce the equivalent output to an 85-watt or higher standard halogen bulb but without the amperage draw and heat of the standard 85 watt bulb. These new high output bulbs are becoming increasingly popular because they offer amazing output at relatively low amperage draws and heat generation.
The other important technology at work here is the tinted glass. A "High Intensity White" coating. This coating has a pale bluish tint to the glass to filter out the yellow spectrum light producing a light that simulates the ultra white color temperature of H.I.D. lamps
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