If need be, you could always raise the lights from the top of the tank. That's what I had to do. It can be a bit of trial and error.. My current tank is 20" deep and my lights (250w 14K DE HQI) sit about 12 inches off the water's surface. That height seems to be just right for my SPS that are on rock work and my LPS'/zoos that are on the sandbed. I like the added bonus of having virtually no salt creep on my lights which I always hated when I had my lights lower. I haven't really heard from anyone who was overly disappointed with either light technology.
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