They are the best parabolic reflectors I have used so far.
As for spread, these type of reflectors tend to direct light down into the tank, more so than spreading it. I find the best to spread light, is a white relector.
Having said that, yes, I am one that thinks it will be enough for your tank. I played with a single 400 over my 4ft. by 32in. 170 gal. I also lit my 70 gal. { 3ft. by 2ft}, for years, with a single 250 watt Iwasaki, in a vertical pendant. You will just have to watch coral placement.
They do get pretty hot in an enclosed hood, like all 400,s though. If you seen some of my other posts, I sold these lights to my friend and was going to use all vho on my 170. One of the reasons why we traded back, was because he ran the pair of 400,s in an enclosed hood on his 120. He cooled it with 4 fans and it was still very hot. He wanted to run a cover glass to keep evaporation down and it was then to hot. As long as you have good cooling fans of air movement and dont cover your tank with a glass top, it should be fine.
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Doug
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