I am finding out that growing babies is like playing golf. There are 25 positions that must be maintaned for a perfect golf swing. Also, there are a million, ( more or less), things to maintane a perfect grow. But,,, fuck up just one little thing,,,, all bets are off. But hey,, we're to have fun ,, right? During my first grow, I had thrips, burned bud tips, lost a heater, got mold. Ended up with 4oz. (6 plants). This grow,,,, I am shooting for a max yield. Should get my 1/4 oz from each of my 6 babies. Lived and learned. As much as I would love to tell you how much you will yield,,, I dont truely know if any one can tell you that. But yes,, 400w will do them babies better than 250w, 600w will do better than 400w, and 1000w will do better than all of em. Happy grow.