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I've had retrofitted HID projectors on my car for quite some time now (1.5) years and in my experience, with long trips (1+ hours) on the highway in dark roads, if your light isn't anything below 5000k your eyes will strain like hell. I remember I wasn't even used to my 4100/4300k Philips D2S bulbs....after a long drive my eyes would be a bit tired. I'm used to it now, but imagine what happens with blue/purple light.
The wavelengths of those lights are MUCH more intense...therefore straining your eyes and also providing less USEABLE light.. all temps put out the same amount of light, it's just we see best with sunlight shades.
also..I was in heavy rain in Sunnyvale the week before new years (for those in the bay area, you might remember how bad it was). Anyway, there was a really uninformed and ignorant driver driving a Honda Odyssey and he had about 8000-9000k HID bulbs inside his halogen reflector housing. He was behind me for a time and it was the WORST drive I've ever had. The light was so bright and so intense in purple that it was reflecting everywhere...road signs, anywhere where there was water, etc. He was a stupidly aggressive driver in an area of heavy rain....so dangerous and it was probably worse for him too. Being in front of him, I couldn't see anything in my mirrors (it was all filled with light).
Light that is blue/purple is deadly in rain...it will reflect off of raindrops, the road, and blind you, please stick with 4100/4300k. If you must have color (which many people do), research on shield modifications to get that flicker (@ the cutoff) that you desire.
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