i have to disagree with a lot of people on this. all my friends that are in the hobby like to laugh at me too. i have 1 48" beamswork reef led (the previous model from the one you suggested- about 500 lumens less i believe) on my 55 gal tank. i have had this fixture for almost a year now. i have LPS- hammer, bubble, duncans (my bubble is actually on the sand bed) thriving and growing. my duncan doesnt stop popping up new heads. i also have a green monti cap, as well as rics, mushrooms, kenyas, GSP, palys, zoanthids. ALL my corals are very happy. I will add though- some of my corals get fed pretty often. my duncan eats alot and so does the bubble. the hammer does not like to be bothered yet it is also growing a new head.