Exo Terra Reptile UVB 100 Tube

The Exo Terra Reptile UVB 100 Tube is a T8 fluorescent UVB lamp designed for tropical and rainforest reptile species that require moderate UV exposure. It replicates the filtered, diffuse light conditions found in humid, shaded environments — the kind of UVB output suited to species that rarely bask in direct, unobstructed sunlight. Available in two sizes to suit different vivarium lengths and lighting setups.

UVB Output and Reptile Biology

This tube produces UVB levels consistent with shaded tropical environments, where humidity, cloud cover, and vegetation reduce the intensity of sunlight reaching the reptile. That moderate UV exposure supports Vitamin D3 synthesis in the skin, which in turn drives calcium absorption and helps prevent metabolic bone disease — one of the most common preventable conditions in captive reptiles.

Vitamin D3 Yield and Ferguson Zones

The UVB 100 is rated with a Vitamin D3 yield index that has been assessed against established reptile UV research. Exo Terra's packaging includes detailed reference data: a full spectral graph, a UV spectral graph, UVB output at distance, photosynthesis data, Ferguson Zone positioning guidance, and the Exo Terra Reptile Bulb Rating System — giving keepers the information they need to position the lamp correctly and achieve the right UV gradient.

Enclosure Compatibility

Both sizes in this range are intended for use across standard vivarium and terrarium setups. The larger option can span multiple adjacent enclosures where a shared lighting run is practical. Choose the size that matches your existing T8 fixture and the internal length of your terrarium.

For keepers housing tropical species that need consistent, measured UVB without the intensity of a desert-rated lamp, the Exo Terra Reptile UVB 100 Tube gives you calibrated output backed by clear data — so you can set it up with confidence rather than guesswork.