HID Color

[fD3S]

Actually, all OEMs use 4300K bulbs (the color temp. of sunlight), and the apparent color difference you see from car to car is because of the design of the projector.

Correct, the projector lens will refract the light. If you point the beam at a wall or garage door, you will see solid color below and as you approach the cut-off point (line) you will notice a tiny spectrum of colors barely noticeable. The further away you get the larger the spectrum becomes. Therefore when an oncoming car is really far away, it may appear is the lights are purple. As it approaches you will see all types of colors. Purple, blue, white. This happens even on non-HID regular halogen headlights with projector lenses.

I hope that makes sense to everyone.

EDIT: I found a great image that shows exactly what I'm talking about. Notice the spectrum. It may be more noticeable in other cars with different setups. My motorcycle's projector flickers between all types of colors when I come from distance, sometimes even greeen!