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Info from bilinvicRetrofits FAQ Section:
Q. What's the difference between the bulb colors?
A. Kelvin Ratings: 3000K - Has a golden yellow output perfect for use in fog lights. The yellow light penetrates through snow, rain, and fog more effectively than white or blue light. 4300K - Has a slightly off-white output similar to that of sunlight. Most cars that come equipped with HID headlights from the factory use 4300K bulbs. If you want the most usable light, 4300K is the Kelvin rating for you. 5000K - A pure white output, no tinge of yellow, and no tinge of blue. 6000K+ As you move into the higher kelvin ratings, your light output will appear more bluish-purple in hue, but the bulbs won't be physically as bright. As HID bulbs age, they go through what is known as "color-shift". When the bulbs are brand new, the output is whitish-yellow and as physically bright as it will ever be. As the bulbs age with use, their output turns more pure white/bluish and also starts to dim a bit. That's why cars with factory 4300K bulbs that are 5+ years old look like they're running 5000K or higher bulbs.
Best way I could explain it. Hope it helps.
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