I've been looking around a bit and I can't seem to find them anywhere. I would really appreciate it if you guys could give me some links to sights that carry vertical air cooled tubes in stock. All I have been able to find are the veritubes which accomidate multiple lights for colliseum like grows. What I need are tubes that will accomidate a single 1000w or 600w for the tree grow currently being pieced together. The fans were just running too much last go around and I think I could cut down on the costs of LP as well as electricity (if only by a little bit) by making this system a little more sealed.