Setup Question

hi im using a box that is 3 square feet total, running 4 ft floros,what would be a reasonable output? right now i have 2 ballast running 2 lights each, so that means as of now i am running 4100lumens per square foot, is this going to be enough for flowering as well? does anyone have any setup ideas? i have the two ballast hanging together and my plant isnt directly under a light its kinda positioned in the middle of both, is this ok?

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I'd say you want quite a bit more. This is what i read from someone on here:
2000 Lumens/sq ft is the minimum for growth

5000 Lumens/sq ft is the average and plants would do alright

7000 lumens/sq ft is optimal


I would pick up a few CFL's to up the lumage