3 x 9 3 400watts or 3 600 watts or 2 600 watts

i am growing off a generator and am trying to set up for the most efficient use of lights in a 3x9 area. I am setting up for a scrog with 4 3x9 areas and am trying to keep the power down but am still looking for the best outcome.
any input is helpful
thanks

I would go with 3 600 watters per 3x9. You get more than 50w/sq foot and penetration of the 600w for the scrog. You can probably get by with 2 600w if your not filling the whole 3x9