The Exo Terra Reptile UVB 150 is a compact fluorescent bulb with a very high UVB output, matched to desert environments. Deserts get more direct sun than anywhere else — few clouds, low humidity, and no canopy to cast shade — so bearded dragons, uromastyx and other arid-habitat species evolved under, and need, far more UV than a rainforest species.

Why UVB Is Not Optional

Reptiles use UVB to manufacture vitamin D3 in their skin, and without D3 they cannot absorb dietary calcium — no matter how much calcium you dust onto their food.

The result of getting this wrong is metabolic bone disease: soft, deforming bones, tremors, a rubbery jaw, and eventually death. It is among the commonest causes of illness in captive reptiles and it is almost entirely preventable. Desert species are especially vulnerable because their requirement is so high.

Note that glass and plastic block UVB. A window will not do it, and a bulb mounted outside a glass lid is doing nothing at all.

Key Features

• Ideal for all desert-dwelling reptiles
• Ultra-high UVB output, effective up to 50 cm (20 inches)
• Recommended for screened terrariums and dense screen covers, which can filter out up to 50% of UVB
• Provides the UVB needed for calcium metabolism
• Self-ballasted — a regular screw fitting is all you need
• Available in 13W and 25W

Specifications

Setting It Up

• Mount inside the enclosure, or above a mesh top. Dense screen filters up to 50% of UVB — this bulb is strong enough to cope with that, which is why it is the usual choice for screened setups.
• Position so your reptile can bask within 50 cm of the bulb, and can also move out of range into shade.
• Fluorescent bulbs do not provide meaningful heat. You still need a separate basking lamp.
• Pair with a high visual-output bulb such as the Natural Light for a brighter terrarium.

Replacement

Replace every 6 months. UVB output falls away long before the bulb stops giving visible light — a bulb that still looks perfectly bright can be producing almost no usable UVB. Write the fitting date on the base of the bulb.

Safety

• Do not look directly into the bulb.
• Always provide a shaded area so your reptile can move out of the UV.
• Let the bulb cool completely before handling.