HI Blades, I'm undergoing another experiment... I've got an existing 400w Digital Ballast and a 6" inlet/exhaust enclosed hood that 22 inches long. I have a pal who has an extra 400w hps ballast. I have an extra mogul base. I'd like to add a second bulb (it'll fit, but will have to be mounted a little higher or lower than existing bulb) during flower at the exhaust end of the hood. I know i'll have some temperature management issues and may have to buy a larger can fan, but other than that, does anyone see any other issue with adding the extra bulb? I'm trying not to buy a second hood and to stick with one centrifugal fan. Thanks, Elroyyboy