Both of you guys are wrong. Firstly, the lower the Kelvin temperature, the more yellow your light will be and the more light will be output, and the cooler the bulbs will be the lower you go. As opposite of that, the higher the Kelvin output, the more blue the light will be and thus you lose more light, and the bulb will be hotter as you go up.
The most light comes from a 3000k bulb in terms of lumen output, the "best looking color" has nothing to do with it. The closer the color of the bulb is to actual sunlight, the brighter it will be. A perfect example is a fire flame that is yellow as opposed to the flame that is blue (the yellow flame is cooler but outputs more light, the blue flame is hotter but outputs less light).
Also, bad choice on the HID high beam kit.