Hey Hpchacrx, from the short time I've had it, I'd say these can easily outdo hps watt for watt. That pull was on my first full run with these lights, imo it could have been 13-14 zips and those weren't huge producing strains. 3 of those lights in the same conditions would pull close to the same wattage as 1x 1000w hps and would have pulled 32 oz/2lbs in a so-so run I just finished, up to 3 lbs. with the right strain, method and fine tuning. Running 4x 30" plants with some training in my style grow and the right strain, I think they can pull a pound per unit. That's 385w total pull @120v, and 340w @240v pulling that kind of weight. I'll be trying to hit that in a couple of rounds, probably with some Blue Dream as it looks like I have a good pheno going. Put them over a hydro SCROG, or vertical and you could pull out more if going for numbers. I know/like soil so I'm just trying different methods to get the most out of them, I just grow for a hobby, that happens to pay for itself