Zoo med reptisun 5.0 uvb t5 ho high output lamp the award-winning, industry- standard uvb lamp for reptiles. A full 5% uvb output allows vitamin D3 synthesis to occur naturally, preventing or reversing mbd and other health problems in turtles and tortoises, bearded dragons, iguanas, and all other diurnal reptiles. The reptisun 5.0 is effective for uvb induced photo conversion of vitamin D3 in reptiles skin at distances up to 12". accept no substitutes; get the Original Reptile uvb lamp - zoo meds reptisun 5.0.