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I had both 6K for low beams and fogs, then I got bored and changed it to 3K. Not going to lie though...the 6K did add more output to my low beams, but I still like my 3K fogs.
Still curious to see what 5k combo (lows and fogs) looks like on the IS in comparison to the 6k. 6k is a little high for me and I don't want to lose that much light output or be to blue.