---
title: "UVB lighting: why it is vital for many reptiles"
description: "UVB lighting in the vivarium: why UVB drives vitamin D3 and healthy bones, which reptiles need it and why LED alone is never enough."
---

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August 5, 2026

# UVB lighting: why it is vital for many reptiles

## Vitamin D3, calcium and healthy bones

### What UVB does in the vivarium

UVB light enables vitamin D3 synthesis and therefore calcium uptake – the basis for strong bones. Without UVB, serious deficiencies can develop, including metabolic bone disease, particularly in young animals.

### Which species need UVB?

- **Essential:** bearded dragons, chameleons, tortoises and tegus – diurnal baskers.
- **Recommended/beneficial:** many geckos and snakes.
- **Usually not essential:** most nocturnal snakes such as royal pythons and corn snakes – although a day-night light cycle is still worthwhile.

UVB is almost entirely blocked by glass and acrylic. The UV lamp must shine into the vivarium unobstructed – never behind a pane or cover. Otherwise it has no effect, even though it is lit.

LED light alone provides no UVB – combine daylight LEDs with a proper UV lamp. UV lamps also lose output over time: replace them as recommended by the manufacturer (often after 6–12 months), even if they still light up.

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