If you had 20ft ceilings in a 15x10ft room, do you think you could do a huge DWC grow with 4 plants and use garbage bins as the buckets? You could get 2x4s and make a grid up by the roof to hang lights/tie up plants from. I was thinking that if you put a huge (reallly big) air pump in the center and ran 4 lines, 1 to each tub, you could probably oxygenate them all. Then just hang 2 1000w up there and then have 4 600W in each corner of the room. I wonder, what kinda of yeild you would get off of a 15 ft tall plant?