HID Xenon Bulbs - How to get white light above 8000K?

The K is kelven which is a tempature reading. I believe 5600 is considered pure white. It does not directly have to do with power or brightness. The color comes from the materials that make the light source itself and the materials in the optical path of the light. Often its a carefully planned out system. The source may be a little off color in one direction so they put something in the optical system to correct it back to the desired color. The optical system starts with the glass envelope that contains the light source. In the case of a headlamp then there is the reflector and the lens.

To my knowledge, the K rating has nothing to necessarily do with power it is more the color of light. I'm not positive of the science but different colors appear to be brighter than others. 8000K and above tend to be a bit useless as a headlight that will help you view the road..

As a note, you can actually be fined for having lights that appear too blue, like the 10000K and above (in my area atleast)

You don't. Nor do you know what you are talking about.

You are NOT increasing wattage with an increase in color temp. They are still 35w or 55w HIDs.

12000K Gay(h)ids are some purple looking shiit.

You want white light? Stick to somewhere around 4300K HIDs.