2 plants will yield the same as 8... just my .02. This plant is 44 days since sprout in the pic taken. Would be bigger but it had a brother.. so recently removed the boy and this one is getting set up for transplant and trellis.
That’s the size tent I have. On my 1st grow still. 8 weeks into flower. Still got a ways to go but you just set a bar for me. 11 oz from a 2x4. How many plants tho? I have 1 in there now and I wouldn’t have room for a second.
I have grown in an 8 x 4 tent with 3x600w hps, but they where inline reflectors that pulled the heat. If you are going open hood I would stick with the two 600w. Its better to have 2 good producing lights than 3 shitty producing ones because they overheated the tent. I suggest starting with the two 600w, seeing how a grow goes, and add another light from there.
Expanding on this thought, your lights are going to heat the tent up to the point of the temp controlled fan just being on anyway. So just keep it on. There is no point in having it turning on and off, interuppting air flow, and causing mold. Temp controllers on a duct fan is just a useless accessory that they use as an extra selling point.
I’d go with 4 plants and lots of Low Stress Training/Trellis if it was my first grow. It will give you same yield as 8 plants in a 4 x 8 and you will have less work, Less watering and less stress.
