I've read before claims of people pulling a pound with a 315. I haven't seen it personally. The best I've achieved so far is just a little over 10oz. I've only did 2 grows with the 315 so far I was using a 400hps. I was going to try a 9 2gallon pot sog in coco coir with maxigro and maxibloom...
I've been growing for about 5 years. I'm currently using coco coir,3x3 tent and a 315cmh. I joined the site in hopes of improving my growing ability and see how other people grow.