AH Supply did have some 7800K bulbs that are perfect. They are not too yellow and not too blue. I like them better than the 6700K bulbs, which can look really yellow at times. 10000K is nice too, but can be too white. I like to mix 6700K and 10000K when those are the only ones I can find, but if its for a side by side fixture (like for a 55g), then you might want to choose 2 of the same colors.