I agree most are different, i had a 175W 10K on my last tank that must have been 12K or above. I've been using 250W XM 10K's with a PFO ballast on my new tank, and they are bright white, Don't look yellow at all to me, white, but not yellow. For the record my room is painted yellow, so probably would offset any "yellow" look that comes from the bulbs. It's like painting, same color in 2 differnet rooms looks night and day different.
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