Ive currently got six plants in a 5x4 (x6ft tall) under a 400 watt HPS. 2 heavy duty fruity, 2 grand daddy purp, 1 purp kush, 1 pink lady. HDFs are 1.5ft tall, GDP 14-15 inches, purp kush 1ft, pink lady 8.5 inches. Started flowering 3 days ago, showing pistils already after 36 hour dark period. Thinking of adding a second 400 watter to begin rotating 3 sets of three plants 3 weeks apart into flowering. My temp and humidity are perfect, no co2, light held at 12 inches from all plants with no burn. Using a low bloom 1-4-5 fert. flushing each weeks end and slowly upping dose. What kind of yield can I expect on my first six plants I have now with just one 400 watter?? Two 400's??