In a 7 x 10 you will need 2 lights with only a 6ft ceiling. Leds dont put off very much heat compared to an hps. My room is also only 6ft high and I have no issues but tall sativa would be a problem unless you scrog.
My last harvest was 1.5 lbs and harvest before that was 1.7lbs and that from my 3.5’ x 5’ grow space
You could always make your space smaller unless your looking to grow a large number of plants
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