10k is way too dark blue. 6k is blue enough. When you go past 5k you start to lose lumens of light (light output).
Color Temperature Chart:
Pic of 6k on my old car (ignore the scratch):
Still bright at 6k:
Blurry due to, I was driving when I took this picture. However, you can still see how bright 6k is on a dark road.
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