Halogen headlamps are old hat now; xenon headlamps are the thing to have. (Xenon, as you probably know, is not a halogen but a noble or inert gas.)
The Car Buyer website tells us that "Xenon bulbs (also referred to as high-intensity discharge or HID) are more expensive but last longer, are far brighter and emit a white light that’s more similar to daylight [than that produced by halogen bulbs]. Because they cost more, they tend to be a desirable optional extra on hatchbacks and family cars. Executive, luxury and sports cars are more likely to have xenon headlights fitted as standard to help mark out their premium status."
Well that's something I learned this week. But it's interesting that I learnt it on a website that's about cars.
The wording used in this question seems to come from the Wikipedia page on headlamps (rather than the one about xenon): "The xenon gas allows the lamps to produce minimally adequate light immediately upon start, and shortens the run–up time" (my italics).
Maybe this is a question for a car enthusiast, more than a scientist.
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