Hey Jewdub - I was using 200w CFLs...1- 6500K for veg & 1- 2700k for flower...in one of those Mylar lined 36x20x62 grow tents for a while & that worked fairly well for like 2 plants. Autoflower plants worked better for me than the photoperiod plants did with that set up, but after I switched to a 400w MH/HPS convertible ballast lighting kit the difference was remarkably obvious. Now I had to add a couple of 6" inline fans to the tent...one for intake & one for exhaust to deal with the heat, but those tents are ready-made for that kind of simple mod. You can still find those pre-wired inline fans on Amazon for like $24+ shipping each....Anyway...I guess what I'm saying is that IMO, 4 or 5 autoflowers would THRIVE under a 400w kit in a tent, as long as you managed the temps.
Good Luck & I hope you find a solution that works best for you.