It depends on strain, quantity, lighting, ventilation, size of the room, duration of veg cycle. A lot of factors. I've pulled off almost 2 pounds in rockwool with 1000w hps, 4 trainwrecks and 4 skunk#1, with 3 weeks veg. My grow right now is in a 5x5 tent with a 630w CMH and 16 Animal cookies in...