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Their FAQ cites roughly 40" x 30" coverage for one fixture. That's kind of an awkward spread for the typical 4' tank. Would a 4' mixed reef really need 2 of these?
Think of each unit as an 8 bulb 24in sunpower in spread. I have done 36in tanks with sps and 24in sunpower no problem. On a 4ft tank if you have 2 you can grow anything anywhere.