sorry bout that the flouros are double tubes at 40w each tube 2 on each x 20 fixtures. so i think thats 1600w i think i might go the way of the HPS i will have to get the walls built to see how they will fit. in what pattern to get the most use of the lights. anybody tried the zig-zag pattern of lighting? heard about in high times "best of issue"2005 maybe? turning on half the lights for two hours, then the other half and so on in a zig-zag so the plants are always getting light during the 12 hours just at times its much more intense supposed to cut down on energy costs a lot, but takes about 2 more weeks in flower.. thanks