the reason so many lights if you take 3600 watts and you divide it by 126 sq ft that only puts me at 28 watts a sq ft in my flat gardens I run 50 to 75 watts a sq ft so in order to get the yield that I want, I need more light to cover more area I know there is still a 22 watt min differance that will be made up by being closer to the bulb I have a digital lux meter what I need to acheive is 30,000 lux at the top of the plants. I few watts may be wasted by being next to one another but that really dosn't matter to me. what you have to remember here is this is like having an 11 x 11 size room. It probaly not neccacery to have that many lights but our goal here is yield if I take my last grow as a referance this should be a 8.5lb set up maybe more do to being a better strain.