4x4 tent. I have two HLG-240H-54A drivers running six QB96's. They can be cranked up to close to 600watts, but I generally run the tent around 450w to 480w, pretty sure I was at 450watts for that run, because they were so tall I didn't want to bleach them. QB96's are a lot different than your 300L and 288 based boards in general, because QB96's use high-powered 5050 type diodes, as opposed to the mid-powered 3030 diodes (LM301H). With each individual diode on a QB96 getting 3x the wattage of a LM301H, you need more headroom with these boards. I love them though; 4k white diodes, plus 630nm and 660nm added reds.