Syd Barret, Yes it could be done that way also. I'm only using four 105 watt CFL's and one LED light. They are only supplemental spectrum. I'm down one 600 watt transformer right now. I bye the universal digital transformers so I can go MH or HPS. The main cola of the GT is about beer bottle sized now. New growth is forming quickly and the calyx's are covering more each time I check her. Heavy Malawi influence with the strong earthy wet soil aroma. Some of my testers stopped by to see the girls. Unanimous, I want to try that one!!! Peace.