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I read once that the HID's and Xenon's will glare very badly if the headlight lenses are not kept clean. It made sense to me when I have seen them bright but not offensive as well as bright, glaring and quite offensive.
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I've seen glaring HIDs and acceptable HIDs on other cars too. However, my biggest gripe with HIDs is when they're installed on SUVs. Every passenger car I've ever seen them on has been fine and didn't affect my vision because the light was discharged below my eye level. When an SUV (or truck for that matter) has HIDs installed it doesn't matter how clean they are they ALWAYS create glare for me, because the light is ALWAYS discharged at or above my eye level. I've yet to see an SUV with HIDs that didn't blind me.
Frankly, one of two things ought to happen. Either they create an maximum headlight height requirement for road driven vehicles, or make HIDs illegal for use on vehicles with headlights above a certain height. Don't get me wrong here, I'm all for the better visibility and safety that good headlights provide, and I'm all for allowing people do what they want to their vehicles, but street driven vehicles ought not blind other drivers at night. A blind person driving towards you at night is far more dangerous than driving with the reduced vision of 'regular' headlights (compared to HIDs).