Fluorescent UVB Bulbs fit into most standard T8 or T12 sockets, allowing them to be used in most standard aquarium light hoods or shop lights . The length of the bulb allows it to provide light and UV over a wide area. These bulbs produce both UVA and UVB, which greatly improve the well being and health of captive animals. Bulbs come in 2.0, 5.0, and 10.0 models, with the higher numbers emitting more UV. Fluorescent UVB Bulbs should be changed every 6 months. Although they are relatively inexpensive compared to other UV sources, these bulbs are relatively weak. Animals should be able to bask within 12" of linear fluorescent bulbs.
Not all reptiles and amphibians require the same amount of UVB to be healthy. Exposure to sunlight will vary greatly depending on species, their natural environment, and their habits in the wild. Many species of reptiles and amphibians are nocturnal or live in burrows or on the floor of the rainforest, such as crested geckos, leopard geckos, or poison dart frogs, and are not exposed to significant levels of UVB in the wild. For these species, low levels of UVB, such as 2.0 bulbs, (or none at all!) are sufficient. Some species, such as many chameleons, live in forests, where much of the sunlight is absorbed by foliage. For these species, a moderate level of UVB, such as a 5.0 bulb, is appropriate. At the opposite end of the spectrum, there are reptiles that thrive in full sun environments, such as deserts. Common pet lizards such as bearded dragons and uromastyx thrive under intense UVB expose from 10.0 Bulbs.