I have several of these lights I also purchased from Nick and am starting to get very good growth on my SPS. I say starting because I started a large grow out system over a year ago but it was from scratch so I needed a lot of time for the tank to mature and cycle to receive similar results from my display tank that at the time had metal halide and had been running for 5 years. Now I can say that my SPS are growing excellent under the D120's. Initially when I first transferred some coral and I was only a couple of months in they didn't do so well but that is a learning experience again on how long it takes to cycle a tank (or in this case multi tank system.) I also have other things in this system like candy canes , GSP, Frogspawn, etc etc doing well. One thing that was really interesting for me on these lights is I found the way my SPS corals grow to be very different from LED to Metal Halide. For instance I have a staghorn coral that always grew in long branches under metal halide but when putting them under these LED the long branches that remained singular stalks for years started growing little branches off the main branch when they never did before. This was actually with the 36" model that I replaced my MH light on my display with but my D120's are also bringing excellent growth.
It's been interesting!
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