I haven’t been using one in the summer because my torts just get natural uvb in the sun. They have indoor and outdoor enclosures and just come in at night. I’ll try to explain it better. If you have a piece of plywood just put it so that it is in the middle of the enclosure, so that parts of the wood are hanging off the side. Then, hang and tie the fluorescent tube at the bottom of that piece, using the metal chains that the fixture comes with. Hope that helps.Do you have a picture of it so I can see what you are talking about? Thanks so much for your help!