You'll need six inch ducting and a six inch inline duct fan (mine is a 440 cfm)plus intake and outtake. With cool tube in place and working correctly I can get mine down to within 10 inches and could go more......but too close and it decreases the light's footprint.
Weedhound Reviewed by Weedhound on . Cool Tube lights and heat signature Hello, I don't know much about cool tubes but it sounds like a great concept. I found some for sale on various websites but don't really know how they work. I saw some duct tube attach to one side of the cool tube. I am guessing that it connects to a fan. Does the other side have ducting attached and what is it for? Also I was interested in the 1000W cool tube light. How serious is the heat signature on something like that? Rating: 5