Honestly, 1 sq ft isn't enough space for a single plant. With only 3 ft of height, is what I am assuming, you will have to do some serious topping and trimming. This adds time as the plants need to recover from the stress. Also that many plants in such a confined space could cause powder mold and lead to other plant stress related problems. You will need a lot of air circulation and proper ventilation. Are the plants an "auto-flower." Most auto-flowering plants are short and will bud without the need of spectrum or time change.

I dunno, Good luck and keep us updated