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I run 4 600's over a 4x8 e&f table (actually I run 2 of these side by side) 4psf harvesting 1 table a month. averaging between 5&6 a month running DP power plant (never seen a better SOG Strain in all my days)...
With that amount of space i'd say 3 1000's is way to much light. Two 1000's or even two 600's would be fine. I don't think with three lights your gonna see a big difference. Only if your going to be growing huge plants the lights going to be beneficial..