I have 35w 5k in my truck low beam and fogs, 35w 5k hi/lo in my Element, 35w 5k H3s in the side lights on my trailer. The color is white. Soon as DDM get some 55w 5k H13s in I'll have them for my RZR-S. I think they recommend 6k and up 55w is because 5k would be way too bright for street use.
HID color chart | Xenon colour chart
HID color chart | Xenon colour chart