Wait, did you say 2 ounces off of 7 plants under a 1200W HPS??? If so, those are really, really poor results. If it's 2 pounds, show me the dried photo. So you're running 2, 600W units, and what, 6 of those $300, 9W grow bars? I see they've gone down to $260 each now...still a joke.
All in...