ive only heard 2 bad things about these bulbs, you and sanjay, sanjay said he hasnt tested them yet b/c reef grow 15k bullbs are new and he hasnt got to them yet....i like my color, lets hope the growth is good, i havent seen any change dramatically yet its only been 2 days though i think my tank is starting to recycle b/c of it.......hope not....anyhows thanks for the input, but these 15k bulbs are new and catalina used to be the manufactuer but they changed names and some other thiings around, lets hope they changed the way the design them too...ill keep you posted