Like I said... I run 320(s), that is all I run, 3 plants under each one at 240 watts, 80 watts per board, and I run 2 x 320 in a 5x5 (6 plants) under 480watts total, and I always pull 34 - 36 zips on 112 day cycle, 7w veg, 9w flower! And I could pull more, but I only take the first 18 inches...