18 Inch T8 Zilla Slimline 50 UVB Desert Fixture Slimline Tropical Fixture includes a 18" Tropical 25 T8 fluorescent bulb with a UVB output of 25 mic Ideal for Anoles, Day Geckos, Tokay Geckos, Iguanas, Basilisks, Chameleons, Chinese Water Dragons, T Fixture and bulbs in one convenient package! UVB light output promotes proper calcium absorption for reptile bone health Simulates natural daylight and fulfills photo-biological requirements of reptiles