That is pretty much exactly what I planned to do with my 6 plants, but decided to pull the top 4 down a little, and make each plant have a a flatter even canopy as the shorter stems grew up in the middle. Really happy with it, my first real attempt at "planned" training. Toyed with it before, but never this well. Either way it seems to be working cos I have the earliest proper budd sights in my growing experience...8 days after turning 12/12!!! I'll throw some pics up tomorrow cos I just can't believe it!! I think this is becuase low heat and a flat canopy means I can keep all tops 6-14" from the bulb itself, and temps, humidity, and nutes seem to be spot on.
Really, 3 per plant, so around 12 in total?? That's reassuring, cos i'm new to HPS, and after some nightmare genes and timer issues on my first 400 grow, I was hoping for big things, and would have been more then happy with 1.5 each from my 6 (9 total), which I recon would have been about the same height if I hadn't really tied em down. I recently harvested 3 plants under my 250. and got 32-36 from each, and could have fitted another one in there, had I kept another clone, and that was a lower yielding strain (but it tasted so good, ppl started chain smoking for the taste alone.