Greenhouse question regarding pot size

If you had 9 sq feet per plant in your greenhouse with a 15' ceiling and were using light depo with supplemental 1000k lights, how large of smart pots would you go with? I was originally thinking 30-50 gallon but after lots of research I don't think those will be large enough.

1: I would not use "smart" pots - their not! Don't hold moisture for shit and cause a root ball in the center of the "pot" that's hard to water as all it does is run past the root ball and flow right out the pot".

2: I would consider more area per pot and less plants and go with 75-100 gallon pots! Outdoor plants get massive and yield huge......Don't try and contain one to a 3x3 area expect reaching good potentials.