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stock bulbs (d2s) are 4300K. change it to 6000K a white with a hint of blue hue. or 8000K blue with a hint of white. or 10000K which is pretty blue, deeper blue~
if you have xenons, those bulbs are D2R for 02-04, D2S for facelift 05+ model.
Bear in mind though that the higher in temp you get the less useable light output you create. I wouldnt go past 6k if you just have to have "bluer" light output.