Mine just came in today and i've finally got it plugged in and working.. I was previously using 3x250mh Phoenix 14k bulbs... All i've got to say is this thing is WAY WAY WAY brighter than my metal halide setup... had to turn brightness down to about 65% so that my corals don't bleach... of course i'm going to slowly be turning it up and allowing corals to acclimate... this thing is amazing... probably the best purchase i've ever made for my reef tank...