I grew some LR2 autoflowering plants. They grew from 14-18 inches tall. I had them on a 24/0 light cycle under a 400w MH and they still took a little longer than they're supposed to. With serious heat problems (95 degrees F) and a mite issue that i had to fix, i still yielded around 18g per plant dry. I was growing in soil too, not hydro. Not sure if that has any effect or not...

I put up a grow log for the grow. You might wanna check it out...

Peace!