I have a nova extreme running 4 x 10k and 4 x 460 actinics. Bulbs can with the unit. It is a bit white for me. Since it new i wait a bit longer to see if I like them. I had a chance to run URI VHO 2 x Actinic and 2 x White Actinic (12k) and I really like those. I saw more coral growth with those than I have seen with MH's. That combination brings out the pinks and lighter colors in the sps
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