Question, in a grow area of 3'x3' square w/400w HPS, what kind of yield increase would someone get going from 3.5' to 4.5' tall? I have two cabinets to chose from, one is 5.5' tall and one is 6.5' tall. I figure leave 2' for my mother/clone chamber and that leaves either 3.5' or 4.5' for my...