I only had room for four 3'x2' trays under 1600 watts of HPS, plus a tiny tent in the corner for 8 moms and an aero cloner below. Average yield was about 11 oz. every 2 weeks. Such a great little perpetual sog, I made about 100k per year off that room. Of course, that's before medical then rec came to Illinois. I sold all of it to a small collective of musicians and DJs anywhere from $350 to $480 per ounce. I spent a lot of it on fun shit, but managed to save a good deal of it, as well. Just bought my house all cash (that grow room was in a tiny apartment), and had a pro electrician wire up one of the bedrooms with an 8000 watt capacity for $3200. I'd never be able to fit enough lights in there to use all that power, maybe half that in the summer. But it's nice not to have to run cords from all over the house this time
Of course ounces only go from $120-$200 now. Glad I could take advantage of the gold rush while it lasted...