Yaild

50-60g/sq ft is about all you'll get with ambient co2 (50g/sq ft is 538g/m^2). it doesn't matter if you use an hps or LED. If giving 35-40DLI in ambient co2, it'll come down to genetics and how organized your canopy is to most efficiently absorb the majority light. Bear with the conversions... you've got about 31 sq ft, so ... 1550g / 28.35 = 55oz should be achievable with an average yielding pheno. 70oz is about 65g/sq ft. and that's doable in some locations. I'd wager your co2 levels may be slightly higher than the average garden. Probably would take clones of a heavy yielder to consistently do that, but also may be that someone people can't recognize they are measuring from the taint. light and co2 allows for yield. not light technololy. can cct and other characteristics impact morphology, sure, but it's not drastic given common sense range of these physical light properties in a standard grow light. e.g. redder light does promote a taller plant but it willnever turn a bush into a lanky stretchter - just because something has a proven effect does not mean it is a profound effect you can notice in any 1 plant growing. you can maximize outcomes with efficient methods and good choices, but you cannot circumvent the laws of the universe. light and co2 are the factors that matter most. what we control is 5-10% of the total, with basica competency being the floor in this context. no point in comparing to fucked up grows.