I've ran the Aq. Science 15K and 22K bulbs. Not a big fan of the 15K as its more of a 10K bulb and has a yellow hue to it. The 22K bulbs are really nice and blue with a tint of actinic to them so you still see some phosflorescence in your corals. Next time I'll be replacing the 15K bulbs with either KZ New gen 14Ks which I've ran before, or ATI Aquablue specials.
My current bulb combo is : 2 Kz New gen 14K, 4 Aq. Science 22K, 1 Aq. Science 15K, 1 Kz Fiji Purple
This combo is a little too white for my liking and would be somewhere around the 12K mark as its not nearly as blue as 14K but slightly more blue than 10K.
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