If you veg for 5 months.....you'll get 10ft plants at the finish, if not bigger! I suppose that is light dependent in a way, but that's not the point....I'll still say that SOG is what your looking for......
I mean if you were to do a big vs small 2 grow run,,,,yeah you could grow some bigger.....BUT, your problem is you have 1 space and everything should be run at the same size to eliminate shading problems down the road........
You should be able to get near or to 1.5lbs of dry product in that space when flowering at 10" to 12" but space will come into play with that many plants......flowering at 8" to 10" would be better....
Exactly how much space do you have to work with????
All I've seen to limit you so far is your height limit of 7 ft......Your going to have to forget about veg times and pay attention to plant height to manage your height limit with accuracy!
So then if you have room for more lighting, you could do 2 area's of differing plant heights....Each with their own lighting.....
I can answer better on your reply.