my 0.02 cents !!

i did in my 4.8is 6000k headlights replacement bulbs from bimmian

and in my fogs i did a 6000k hid kit from angel i bright and the match is dead on balls accurate !!

again in my honest opinion

the stock is 4300 which is closer to white , the 6000k is more of a bluer look i love it i think its perfect not aftermarket looking at all !!

i think if you go to an 8k bulb it'll be a deeper blue and it wont look like it belongs !!

i also just did this on my benz and again im very happy !!

i also disagree with fatx5's comments on light output , the theory is the higher you go on the kelvin scale the less output , 6000 has the same output that my stock 4300 had no noticeable difference

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2013 F10 M5
ALPINE WHITE/BLK/ANTHRACITE