165 watt 7 inches above a 36 bow front tank (18" to sand bed from top of tank) and I run mine at 95% blue 25% white. I killed an acro, favia, and i think monti frag. Zoas, shrooms, Xenia, rock flower nems, near the bottom all grow slowly I would say but I am not experienced enough to know if it is slow or not really. They look great and are definitely spreading but I can't say what is slow. My BTA has gotten huge and he is mid center of the tank. I assume my tank is lacking light for difficult frags this thread is the first thing to make me think otherwise.
If this box really puts out as much light as a lot of reefers here claim, why would it be so cheap, and why would people even bother with super expensive lights? Confusing stuff without a par meter!