Most growers primarily care about yield per sq ft. Its only a very small subset of people that want to try to stretch the watt out as far as possible to try to make (lets say) 600 watts barely light a 8x8, and scrape out a lb an a half or 2 , if they are doing really well, of tiny buds and im really giving them the benifit of generosity here for the yield. Most growers are going to look at a given space and ask, how can i get the most possible out of here? Hang 4 lights, an pull down about 5 lbs of stuff thatll make panties drop.
If your not experiencing that last one, then your doing it wrong.
Personally i could give 2 shits about another 150 a month on my power bill if it means i get so much more of so much better. Then people say, but bla bla bla muh amps cant handle it! Like they cant slap another breaker in the box an run another set of wires. Or use the dryer plug, etc.
I really want led to be worth a damn but it just keeps failing to impress me. I almost just bought some QB's, made a thread asking for the people with the best led buds to please post em up. Pretty much was all small buds that really didnt impress me.