the temperature ratings refer to the color of the bulb.
4500k is white and pretty much closest to the stock litronics.
6000k is a little bluer and IMO looks like the audi/vw lights. although some say that all manufacturers use 4500k.
higher numbers start getting really blue or purple. 10000k are rediculous IMO and would really stand out. so with that said, go with 4500k or 6000k. ideally look at 2 side by side at night so you can see what they look like.
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