On new cars, most xenon-equipped headlights are only offered as a low-beam headlight with a halogen bulb for the high beam. Bi-xenon headlights offer xenon-light output for the low and high beams, and they’re housed in the same headlight capsule/projector.
Bi-xenon headlights typically have a shade or filter in front of the bulb during low-beam operation. When the high-beams are needed, the shade moves out of the way and the bulb’s full-light output is projected onto the road.
Bi-xenon headlights are offered in luxury makes like Mercedes-Benz, BMW, Lexus and Audi.
In general, xenon headlights offer a much brighter light output than standard halogen headlights and are typically identified by their bluish tint. More information on the xenon/high-intensity-discharge headlights can be found here.
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