I have the Phillips 9006XVB2 X-tremeVision Upgrade Headlight Bulb as my foglight for some years now. It's rated at about 3000K. As a supplemental lighiting, I like to get something slightly more yellow , to be able to see in rain and night driving better while driving in the highways.

I'm looking at getting the HELLA 9006 YL Twin Blister Xtreme Yellow Bulb rated at 2900K.Maybe I need a lower Kevin but not pure yellow..