m0useanswered grow question 3y ago I like to aim for a 1x1 or 1.5x1.5 or even 2x2 foot print for one plant. and aorund 100W per plant.
It looks like 4 plants in a 3x3 and under 300W will do just fine.
in short
300W @ 4plants. = A OK
I've grown a few plants sunder 90W low range leds before and it turned out ok.
Good Luck