Well I grew 3 plants under 800w and got 1.5oz each plant. But that is that i didn't measure Ph and i over fert a bit. So cut the watts in half and half of 1.5 is 3/4. So your looking at 21 grams per plant for you. But you could do a better job than me at taking really good care of them and get more. I'm on my second grow now and i am going to do a hell of a lot more for these bitches than i did for the first ones. Be sure to post your yield. Happy Growin!!!!!!!!!!1