Well, actually Josh the corals are a different depths in the ocean and are adjusted to that light. The same coral at 70 feet won't do well in 5 feet of water. 400w halide directly over one puts out a lot more light than a coral would get at say 30 feet. Oh, and it depends on the kelvin rate also. Like 10k vs 20k. I just added the 2 retro kits from 360reeffarms, they are actinics, and I swear the corals are coloring up already... It has been a little less than a week. I also run the 2/250DE HQI's as well as the 4/54w T-5's.