I am running 70w p/sft..in a 3x3 which is pretty intense... and that with 600w give or take 50w ...so at a guess in my head youll want around 1000 to 1200w for that area (if using LED/COBS (like me..)... The most ive pulled to date has been 17.5 oZ dry weight off a single plant in a 3x3...and am...