By the way, you can use the T8 UVB tube as long as it's a Reptisun brand, and as long as it's the 10.0 UVB ouput and not the 5.0, that's a no-no. But the 18" Reptisun 10.0 T8 UVB tube is fine for Dragons, however, YOU MUST STRAP THE ENTIRE FIXTURE TO THE UNDERSIDE OF THE MESH LID USING ZIP TIES, WIRE, TWINE, ETC. IMMEDIATELY!!!. This UVB tube is used by a lot of people, and it's perfectly fine if it's not obstructed by the mesh lid, IF YOU HAVE IT SITTING ON TOP OF THE MESH LID, NO ADEQUATE
UVB LIGHT IS REACHING YOUR DRAGON. It's very easy to strap the entire fixture to the underside of the mesh, just weave zip ties or wire or twine through the mesh and then around the entire tube fixture, and strap the entire fixture to the underside of the mesh lid, OVER THE HOT SIDE OF THE TANK, so that the UVB tube is right alongside the bright-white colored Basking Bulb, so that both lights are "sharing" the top of the Hot Side of the tank.
After you get the T8 UVB tube strapped to the underside of the mesh on the Hot Side of the tank, and you get the bright-white colored Basking Bulb sitting on the mesh right alongside the UVB tube, then POSITION HIS BASKING SPOT/PLATFORM DIRECTLY UNDERNEATH BOTH LIGHTS SO THAT HE GETS BOTH LIGHTS WHILE BASKING!
****For a weaker T8 strength UVB tube you also must make sure that his Basking Spot/Platform is at least within 6" of the now unobstructed UVb tube, it cannot be any further away than 6" for adequate
UVB light to reach your Dragon. ALSO, T8 UVB TUBES MUST BE REPLACED ONCE EVERY 6 MONTHS ON THE DOT, AS THEY STOP EMITTING ANY
UVB LIGHT AT 6 MONTHS OLD! The tube will not be burnt out, it will still light up at 6 months old, but it will not be emitting any
UVB light at all.
The difference between the 10.0 T8 UVb tube and the 10.0 T5HO tube is that the much stronger T5 UVB tube is strong enough to sit on top of the mesh lid, as long as the Dragon's basking spot/platform is at least within 10" of the tube. Also, T5 tubes only need replaced once every 10-12 months. So you do save money buying a T5 tube and fixture.
*****PLEASE MAKE SURE THAT THE BRAND OF T8 UVB TUBE YOU HAVE IS A REPTISUN 10.0!!! If by chance you accidentally bought either a Zilla or All Living Things brand 18" T8 UVB tube, you must not use it, just return it...Zilla is now Petco's house-brand, and All Living Things is PetSmart's house-brand...the other one is ReptileOne...All 3 of these off-brands are well known to emit harmful light rays that are apparently a by-product of the manufacturing process (all 3 of these brands plus 20 or so more are all made in the same factory in China, they are the same tubes, just labeled differently)...They all quickly cause severe eye damage, neurological damage (seizures), and blindness. You can easily search the forum and see the number of baby dragons made ill by all 3 of these UVB tube brands...
The other thing is that some of the tube fixtures come with a clear, plastic cover on their bottoms, that covers the UVB tube inside them. So please check your tube fixture to make sure that it does not have any clear, plastic cover on it that the
UVB light must pass through, IF SO IT MUST BE REMOVED IMMEDIATELY!!! No
UVB light can penetrate any type of glass or clear plastic at all, they both block 100% of the
UVB light emitted by the tubes...