I ONLY recommend factory, but thats just me. There is nothing wrong with 8K, but for me it's too blue. Ebay usually always have D2S bulbs from Osram for now around $80 for a set. Do not get phillips as they start out blue and immediately go all white. I did that a couple of years ago and was pissed. 4300K is the factory color temp and anything higher is not any brighter. Also when you have replace one you should replace them both as the life of the bulbs are off, and they turn purple in color as they start to fail.
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