veg is about 4-6 weeks and i grow scrog style. my 150hps=5oz my 400hps=14+oz. it's all about the screen! you can evenly space all budsites and keep the light nice and close to the canopy. as long as there is sufficient ventillation you can get great yeilds. power and space are my limitations so i had to find a way to get the best yeilds possible with the resources i have available. with my 400hps i get .98gm/watt and with the 150hps i get .75gm/watt that's not bad, eh?