| Xenon head-lights are those new bright blue lights we see on the road. Heating of a filament results in a small part of visible light (classic light-bulbs). Heating of a gas results in a narrow range of visible light.
Make a spark in the xenon gas and you have a xenon light.
Are xenon headlights better then Xenon Lamps then Tungsten Lamps?
Xenon compact arc lamps are filled with several atmospheres of xenon gas.
The spectrum is more in the visible range then the spectrum of the classic Tungsten lamps.
The luminous efficacy of Xenon lamps is approx. 30 lumens per watt
Tungsten Lamps consist of a coiled tungsten filament mounted in a quartz glass envelope that has been filled with an inert gas plus a trace of halogen.
Tungsten-Halogen lamps must maintain an envelope temperature between 250 and 350 deg. C. Tungsten that has evaporated from the filament combines with the halogen gas. Convection currents within the bulb carry this gas to the quartz where it is cooled and then returned to the filament. Cooler temperatures will not allow the halogen cycle to take place, thus causing bulb blackening and shorter life.
Luminous efficiency is approximately 22 lumens per watt.
Intensity Discharge lighting, HID
Xenon headlights 1 at Lighting Research Center
Xenon headlights 2 at Lighting Research Center
a-car.com the car-innovation site