Yeah like a cree setup 12-18 inche from a row of 15 x 48 inches. Vs a 315 filling an entire 5 x 5 tent at 30 inches above canopy. the lec crushes the cob. Im just sharing my experience, I was gonna buy a bunch of these things but not yet. I was never a fan of t5 ho either, the bulbs blew out...