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Well I'm not surprised car dealers don't know much physics (apologies to those that do, of course!).
My guess is that any headlights will produce a lot of heat...even very efficient lightbulbs such as the energy-saving type you can get for the house get hot, certainly giving enough heat to melt snow unless it was really coming down.
I'd imagine the xenons give better/brighter light than the halogens, but as with a lot of things like this, it's just a matter of what you get used to...if you've never had it you won't miss it.
As for claims of 30% better brightness, that is a bit misleading in real terms. If I remember much from my school days (16 years ago), the intensity of light reduces over distance in an inverse square fashion (if the light intensity at a given distance is x, then if you double that distance, the intensity is √x), so the effect would be pretty small and difficult to perceive. Please excuse this amateurish assessment however, I prepare to be corrected...
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