I have plans to try 9 in a SoG under my 600W on my next run..
witch will be in a weeks time
thats 4 plants, with a Veg time on 4 weeks plus two weeks as seedlings, all 4 have been LST for multiple tops..
with 9 plants I plan to only veg for a week or two, and not train em in any way..
also considering to make them 3 middle once directly under the light Auto`s and finish them on 12/12 last 4-5 weeks, so I can pull em before the others and move them in for the final flowering .. lets see still play with the idea, but Im sure 9 is possible, just a matter of growing style ..