Im using two 12 bulbers and it covers it perfectly, gives it about three inches of light further than the 1st and 10th netcup. The only thing that was annoying was its pretty hard to get them to hang pefectly together so i duct taped the together on th ends and they stlill tried to hang in the middle like a slight V shape so i had to take a v hanger for hps lights erc and hooked it where they meet and tied it to the ceiling pulling it ip. But as far as yeild ive heard 2 lbs for an af60 is average with 2 1000watt hps, so im looking to hit that mark or better. Well i figure 14 grams a plant in sog isnt bad multiply by 60 plants is 30 oz. So doesnt seem unrealistic.Plus i watched a soil 6 plant grow under two 12 bulb badboys that yeilded 25 oz. So with that in mind im also using 2 4 bukbers on sides as well so that should increase yield plus strip light down the middle plus im using aeroflo should do alil better, not to mention he vegged and had trees and we all know t5s arent best for penetration so sog should def be best for that type of lighting.