Already have enough manure piles here in the dirty mitten lolin this thread me don't buy manure. we make our own. we even have quite a bit to give away. lol
I know it's late , but LMFAO ! , with knobs on .i got 3 pounds out of a shoebox under my bed once, vegged for two years, set the ceiling fan on fire to replicate the sun.
20oz from a 600w is not that amazing.
46oz is much more impressive. You can go higher than this too.
https://www.rollitup.org/hydroponics-aeroponics/149998-heaths-flooded-tube-vertical.html
My wife had the same system going on a few years back she was playing Pot Farm on Facebook.When I got locked up I was in the bullpen with a guy who claimed he a had a hydro setup that finished in minutes I'm dead serious too