it's just my preference in the color spectrum anything under 6k looks yellow to me, I have 8k hids in the yukon which are not bi-xenon so I only have low beams, I have the fogs aimed a bit high the combination works out well for me 6k+8k, I went to Hid's a long.... time ago so when I drive anything else with standard bulbs it's just ugh, part of it is probably my vision in low light I can't see that well, with bright light I can see pretty good.I have the Morimoto on my 08 Silverado and love them. The color matches my 5500k HID retrofits. Nice white bright light. They’re fogs so they’re not supposed to shine a long distance, they work great for their intended purpose, lighting up the lower area below my low beams. I say if you can use fog lights as high beams then they won’t do well in the fog, not to nitpick @Doubeleive but I don’t see why you want them to do that. Low beams themselves actually shine too high in the fog, and we get a lot of it here. If I hit my highs I can’t see shit in fog.
here is a picture of the ceiling light in my office both lamps are 100w (output) the one pointing left is LED (looks yellowish to me) the one pointing right is fluorescent and looks more white, I can see better on the right side the left side not so much it looks more dim
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