I had thought about the diversity thing. Thought I could get 3 clamp-ons for my tank-- a 20k for the center and a 10 or 12k for each end, maybe run a t5 actinic strip across the front so as not to block the halide lights. I won't be getting huge pendants-- i only have a 55 gal, but 3 of the jbj viper 150 watts should be more than enough, right? Or can you have too much light?