depence on how patience you are .. and how long time you got ..
you have enough light and ceiling hight to veg grown mature plants (+8 weeks)
so rather ask yourself .. how many plants do you want to grow .. for how long time/how big (its a pain in the *** to handle monster plants indoors) and how mouch yield per plant you expect ..
I would probably either do 4 plants and let em veg for 8 weeks (plus 2 weeks from seedling to veg = 10 weeks before 12/12)
keep em in 7-10 gallon pots as end pots (cups for seedlings and 3 and 5 gallon along the veg grow)
or do a sea of green .. get a parabolic reflector
let the 1000W spread the light out (schould be possible to keep it high with 1K Watt)
grow +16 plants (4x4) veg. em for a short time (maybe 3 weeks or so)
diffrent here is you either use the 1000W great penetrations to grow 4 high/larges plants or use it to spread it out and grow a lot of short plants with a even canorpy ..
hope this help answer your question ..