The best growers here would do well to average 1.5 - 2.0 gpw with their best yielders/genetics on a consistent basis and latest tech. Talking about 2 gpw with 1000's is blowing shit up your ass and everyone else's here. Anyone saying that would be anywhere near the norm has no growing experience. Theory is great, just not in real life. In real life shit happens and that needs to be allowed for in your costs so even if you think you can hit 2 gpw, 1.5 should be used to calculate your costs.
So lets look at reality (numbers) and see what 1000w can pull in real life with a couple of techs and using somewhat realistic w/sq./ft. coverage for each tech. We'll work it backwards so we end up with a footprint required to yield 3 lbs from 1000w.
1.5 gpw at 50w/sq./ft. (hps) or 30w/sq./ft. (LED) plays out as follows:
50w/sq. ft. hps:
1000w / 50w./sq./ft. = 20 sq. ft.
4.5' x 4.5' = 20 sq. ft.
1000w @ 1.5 gpw = 1500g = ~3 lbs. from 1000w in a 4.5 x 4.5' footprint (??)
30w./sq./ft. LED:
1000w / 30w/sq./ft. = 30 sq. ft.
4' x 7.5' = 30 sq. ft.
1000w @ 1.5 gpq = 1500g = ~3 lbs. from 1000w in a 4 x 7.5' footprint (doable)
My best yielders could hit the 2nd (LED) scenario but I don't give a f*k who you are and how much experience you have, pulling 3 lbs. + from a 4.5 x 4.5' footprint regardless of what lighting you're using is bull-shit. Calling it here. Move those numbers around as much as you want, it's still bull-shit.