The Hydrotek Cool Star reflector has a 6" air-cooled cylinder to connect an exhaust fan and ducting to remove heat from your HID bulb.
In warm weather vent it outside. If you live in a cold climate, use to for auxillary home heating!
The glass cylinder is made from tough Symex that is heat resistant.
The Cool Star aluminum reflector has a high gloss finish with matching wings to provide optimum HID light penetration to your garden.
There is an end socket that is easily hard-wired into your ballast. Can handle up to 1000W. The Cool Star cylinder is about 20", but the overall length is about 26".