400 watt is too much for softies but not for Clams and SPS. Also not too much if you upgrade in a few years and just spent $1000 on lighting. What swayed me against the Giesemann was the fact that the dollar is very weak overseas right now. This makes this imported fixture quite a bit more expensive than a comparable domestic brand. I think the Maristar gives a better "bang for the buck". Also, a domestic company will be easier to reach for questions and service if needed. I know that I was able to call Sunlight Supply Inc. (the makers of the Maristar) a couple of times before and after purchasing my fixture and was able to get questions answered that day. This is a big plus for me. I know that if I ever have a problem with my fixture, I have access to good customer service.