For that kind of yield in a 3' x 3' I would do a scrog net.Ive never used an HLG,I use mh/hps when not in a tent,but I am finishing a 1 plant scrog in a 2' x 4' tent with a MarsHydro ts 1000 and a 70 watt mh for veg and my ts 2000 alone for flower,my results since buying this light has been good...