why do you say that hid lights are more expensive to run than cfls? to get the same amount of lumens from cfls you will have to run more wattage than a hid. also cfl lights put out just as much heat as hid lights if not more because more of their energy is converted into heat. i think you wouild be better off running a 250 watt hps then your 400 watts of cfls. it will keep your box cooler, youll have better light penetration, less hassle adjusting lights, youll probably get around the same yeild, and your electricity bill will be much lower. to run that many cfls is just a mess of cords and sockets, and that many lights will get very hot in that small space. your probobly gonna need like 10 of those pc fans, so you might be better of just using a couple for intake, and then get a decent inline fan for exhaust.