I built a fixture using aquastyle led to replace a 120W Chinese led panel on my 40g breeder. I switched about a month ago and coral growth has increased observably. SPS have responded the most noticeably and my softies seem to like it a lot too. My LPS haven't really changed much, but also never did badly under the 120W. I combined royal blue and blue 50/50 for 18 led's, and 50/50 10000K and 65000K for 18. I also added two red led and two 24" T5 actinic to the fixture to reduce shadowing and get some light on the edges. The one problem with these like all led's is that with lenses (which you should use over probably ~8" depth) the PAR drops drastically outside of the beam angle. At the bottom of mine with blue at full power and white at half(where I run it) the PAR was ~300umol 12"deep under the light, but 2" outside the light, at 4" deep (this is outside of the beam angle) PAR was ~35umol. I'm also conducting coral growth studies with the old 120W fixture in my school lab, so Iv got lots of PAR readings from both fixtures if anyone's interested and in two months can give some very detailed information about coral growth under these lights.