Need to watch it dude, 6000k and you start to get into the unusable light range.........
BMW, lexus and every other company are using at highest 5000k bulbs, 4100k is standard. You only see blue/purple flashes due to the projector lenses they are using.....and if you see it on a TL or IS300 then it is due to the freeform reflector housings, not the bulbs