i own a cool tube that was bought from Better Grow Hyrdo, with a squriell fan. It works great. My 1000w MH is about 14 inches from top of canopy. Before temps would be like 100F at like 3 feet away, now it stays a nice cool 79F...worth the money and when i ordered it i asked which cools better and he also told me the tube...so i hope this helps!!