Companion Reptile UV-B and Lighting Requirements

Inadequate UV-B provision is one of the most common husbandry failures in companion reptile keeping, causing metabolic bone disease and significant preventable suffering.

Key Facts

Metabolic bone disease from UV-B deficiency is the most common reptile welfare problem seen by exotic vets
Bearded dragons, tortoises, and many lizard species require substantial UV-B radiation for vitamin D3 synthesis
UV-B bulbs degrade and must be replaced every 6-12 months even if still producing visible light
The UV Index required varies by species - desert species need much higher UV-B than forest species
Reptile Lighting Project research has developed species-specific UV-B recommendations for common pet species

Welfare Considerations

UV-B deficiency causes metabolic bone disease, characterized by painful bone deformities, pathological fractures, muscle weakness, and organ failure if untreated. Many reptile owners are unaware that standard fluorescent lighting provides no UV-B, or that UV-B bulbs degrade invisibly. Providing appropriate UV-B through high-quality, species-appropriate bulbs positioned at the correct distance, for the correct duration, is one of the most fundamental welfare requirements for diurnal reptiles. The UV Index (UVI) framework developed by herpetologists provides practical guidance for different species, replacing the outdated approach of simply recommending 'a UV-B bulb'.

What You Can Do

Research species-specific UV-B requirements before acquiring any reptile
Invest in a Solarmeter 6.5 UV-B meter to verify your reptile's UV-B exposure
Replace UV-B bulbs every 6-12 months even if they still produce visible light
Join reptile keeper communities using the UV Index framework for evidence-based lighting
Advocate for pet shops to provide species-specific UV-B guidance with every reptile sold