Last time I got about just shy of an elbow from 6 of one strain in a hydro bubbler and 2 massive plants of another strain in a second unit. This time I have a bigger area and will use 12 hydro units... still trying to figure out what lights to use.
I don't know if your interested,but i have 8 1000watt hps sun systems ballast for sale.I'm gonna switch it up to the electronic ballasts.They are all still covered by warranty thru sunlight supply