I think one of the biggest temptations outdoor growers have to deal with is the need for sun. Because if a grow-spot gets good sun exposure, that means it's visible from the sky.
If you can live with shade, i.e. no direct sun, I think that works out to be 30 to 35 watts per square foot, instead of the 65-70 you might get in full sun.
Then it's a matter of strain.
I have about 5 scrawny girls, and one beefier girl (Blueberry Headband cross) next to a Hazeman E-Stomper Male.
The scrawny girls are 3 to 4 feet high. It will be interesting to see if any of the other girls tolerate the low light and make some Bud