Just an aside but white fog lights won't cut through the fog the same way yellow / off white will. They are that yellowy colour for a reason. Although if its purely for cosmetic reasons it probably doesn't matter.
I agree, I find my xenons completly rubbish in fog give me standard lights in fog anyday. I would much rather have yellow foglights like they use to be in the 50,60,70s than current day ones. I use my fogs to be seen by other road users who are at junctions waiting to pull out etc when foggy like this week, As they stand out more. They also work well on really thick fog to help illuminate the white line and side of the road to help you get through the really thick fog.
