The best fluorescent tube that we’ve ever used for our reptiles’ UVB requirements! Other tubes that we tried either don’t have adequate output in the beginning or they degrade much faster than should be expected. This UVB is necessary for your reptile’s synthesis of vitamin D3, which is essential for the effective metabolism of dietary calcium in its bones and blood. Now protected by heavy duty Kraft thick-wall tube to compensate for Amazon’s shipping inadequacies and UPS’s irresponsible abuse. Some reptiles require more or less UVB than others. Bearded dragons and similar desert reptiles require more UVB and a 10.0 tube is the better choice. Green iguanas, anoles and similar jungle / forest reptiles require less UVB and a 5.0 tube is the better choice in smaller habitats when these reptiles are younger. We also prefer to use the 5.0 tube for our translucent bearded dragons and for our silkback bearded dragons (“silkies”). This T5HO 34" UVB 10.0 Reptile Fluorescent Tube fits the Carolina Custom Cages Reptile T5HO 34" Standard Fixture & Reflector. This 34” model is perfect for oversized habitats greater than 36” in length; although it will "just fit" diagonally in our 36Lx18Wx18H model Carolina Custom Cages Terrarium. 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 have also included a bottle of our Chlorhexidine Solution 2%; 1 refill makes 32 oz. of working solution – just add water! This is the best cleaner for your reptile’s habitat; used and recommended by exotic animal vets for cleaning your cages and other habitat items. Basically, you spray and wipe and then if your reptile licks where you just cleaned, it won't hurt them. See also our Carolina Custom Cages’ listing for “Chlorhexidine Solution 2%; 32 oz. Sprayer, plus 2 refills” and our listing for “Chlorhexidine Solution 2%; 3 refills make 32 oz. each of working solution”.