But see, if you are using a verticle cooltube then all that square footage stuff goes out the window because you are bradcasting the light in a completely different way. You are using the entire bulb effectively, whereas in Al's computation you have to allow for the fact that half the light is going up and then being reflected back.

I dunno - but 1000watts sounds better than 600 to me.
PharmaCan Reviewed by PharmaCan on . 600 HPS Cool Tube Grow Light System 600 HPS Cool Tube Grow Light System is the cooltube wired to the right cordset and plugged into the ballast? i really want to order this system, but every company i email eventually tells me "no we dont wire the ballast to the cooltube"... anyone have one from bghydro that could comment ? Rating: 5