true- true ... my last grows were in a 4x3.5ft tent with '2' 315 cmh, n always felt it just wasn't even light - last grow stepped up to a 5x5ft tent , with a mars fce8000- i ran it at 70/75pct , and the quantity def improved.... but more important i think the quality got better... still learning led's... it is a learning curve for sure...People almost never have enough light.