What would be about the minimum size for a grow box? Assuming I would beit growing one plant? With two 70 watt bulbs and flat white paint on the inside.
So you don't know how tall? Or just about anysize, Would you say about 2 1/2 to 3 ft would be okay for height? And cheap plywood for the construction with a small fan (170mm) to vent?
Yes Its basically up to you.It depends if your doing a scrog or something like that.If your just letting it grow with no training then like stoend said about 3-4 feet or more if you have the room.If you dont have much room then look into low stress training (LST) or a scrog.