Ive had these lights for a while and csnt ever seem to dial them in right. theyre about 6" from the surface of the water and I do get good growth from them but always seem to have them not dialed in roght. As of now theyre at 75 whites/other colors and 50 blues. Ill post a link if anyone needs to know whst im talking about. Also im doing mainly lps with a few sps and maybe eventually a clam of some kind.