I think Brye means incandescent fixture right? This provides basking heat for the chameleon.
As for UVB and the Reptisun linear 5.0, you will need a fluorescent fixture to hold and power your reptisun bulb. The cheapest I have found was $20 for the fixture. It is much cheaper to buy at a hardware store or homedepot, lowes, walmart, etc. I use a 48inch fixture and I can put it over 2 cages at once. Hope this helps!
Home Depot's Fluorescent Lighting