Exo Terra Reptile UVB300 T5 VHO 24W 22" Lamp – PT2431

The ET Reptile UVB300 T5 VHO 24W 22" is a Very High Output T5 fluorescent UVB lamp built for reptiles that demand intense, sun-replicating UV exposure. Manufactured in Germany to exacting quality standards, this 14% UVB tube delivers sustained output for 12 months or more, making it a reliable choice for keepers who maintain desert, savannah, or other high-UV species that bask under open or midday sun in euphotic and heliophotic zones.

Who This Lamp Is Designed For

Species that thrive under intense, direct sunlight — including many agamids, uropeltids, and tortoises — have evolved to seek high UV exposure during peak basking periods. This lamp's output is calibrated to meet those physiological demands. The intensity of UVA and UVB emissions does vary with distance from the basking site, so positioning matters and should be adjusted to your species' specific UV index requirements.

UVB, Vitamin D3 and Bone Health

Adequate UVB exposure drives Vitamin D3 synthesis in the skin, which in turn enables effective calcium absorption. Without sufficient D3, captive reptiles are at serious risk of Metabolic Bone Disease — a preventable but debilitating condition. This lamp's UVB output surpasses that of standard T8 tubes and compact energy-saving alternatives, giving keepers the output needed to maintain healthy D3 levels without relying solely on supplementation.

UVA and Behavioural Benefits

UVA wavelengths are not simply a by-product — they play a documented role in stimulating appetite, encouraging natural activity levels, and supporting reproductive behaviour in captive reptiles. The phosphor blend used in this tube is engineered to replicate the solar UVB and UVA spectrum, producing a well-balanced visible light output alongside its UV component.

VHO Output and Vivarium Compatibility

• Very High Output (VHO) T5 format — significantly higher UV intensity than standard T5 or T8 equivalents
• Superior UVB penetration suitable for taller vivariums or setups with mesh screens that reduce UV transmission
• 24W, 22" form factor — check fitting compatibility before purchasing
• Rated UV output maintained for 12+ months before replacement is recommended
• Unique phosphor blend replicates key components of natural solar UVB

For keepers running tall enclosures or dealing with screen-top interference, the VHO output of this tube provides the headroom needed to achieve meaningful UV levels at basking distance. Pair it with a compatible T5 reflector canopy to maximise efficiency and coverage across the vivarium floor.