Carolina Custom Cages Reptile 22" T5HO UVB Standard Light Fixture, Set of 2 The best fixture that weve ever used for our reptiles UVB requirements! This T5HO (high output) fixture gives superior performance because of its high output electronic ballast and its high-efficiency silver reflector. UVB is necessary for your reptiles synthesis of vitamin D3, which is essential for the effective metabolism of dietary calcium in its bones and blood. The fixtures streamlined shape provides for great flexibility in locating and mounting for your reptiles habitat. Improved effectiveness can be achieved by being able to mount under your cage tops screen mesh. A higher UVB output to begin with, because of the fixtures greater efficiency, can increase the useful life of the UVB fluorescent tube. We prefer the UVB output from linear fluorescent tubes because this way its possible to cover 2/3s of the habitat area; that way the reptile is benefiting from UVB exposure as it moves about the habitat. Power cord (with on/off switch), two mounting clips and mounting hardware; 2 screws and 2 plastic screw anchors. Additional set of clips with hooks; they allow mounting with the 2 Pan-Ty cable ties (heat-stabilized Nylon 6.6). This fixture is a superior addition to the habitats of bearded dragons, Rankin dragons, horned toad lizards, uromastyx, most other desert reptiles, small turtles and turtles. Animal should be no closer than 10 directly under the fixture and no closer than 6 diagonally from the sides or ends of the fixture. We also sell both the Zoo Med ReptiSun 10.0 UVB T5HO 22 fluorescent tube and the Zoo Med ReptiSun 5.0 UVB T5HO 22 fluorescent tube for this fixture.