Creating the right environment for your reptile is the single most important thing you can do for their health. Light and heat aren't optional extras — they're the foundation of a thriving terrarium. Our Reptile & Amphibian Supplies collection carries three of the most essential products: a UVB bulb for tropical species, a high-output UVB bulb for desert species, and a heat mat with digital thermostat for precise temperature control. Here's how they compare and which your setup needs.
1. Exo Terra 13W UVB Tropical Terrarium Bulb
£38.58
The Exo Terra 13W UVB Tropical Bulb is designed specifically for tropical reptile species — think chameleons, geckos, tree frogs, and other rainforest inhabitants. The 13W output is calibrated to replicate the filtered, dappled sunlight found in tropical rainforest environments, providing the precise UVB spectrum needed for vitamin D3 synthesis and calcium metabolism. Without adequate UVB, tropical reptiles are at serious risk of metabolic bone disease — this bulb is the preventative solution. The compact design fits standard terrarium fixtures, making it a straightforward upgrade to any existing setup. At £38.58, it's the most affordable of the two UVB options here.
Best for: Tropical reptiles (chameleons, geckos, tree frogs, anoles), rainforest terrariums, standard fixtures.
Wattage: 13W | UVB type: Tropical spectrum | Key benefit: Vitamin D3 synthesis, metabolic bone disease prevention | Fits: Standard terrarium fixtures
2. Exo Terra UVB 150 Desert Terrarium Bulb – High Output, 25W
£42.45
The Exo Terra UVB 150 Desert Bulb is the high-output option — designed for desert-dwelling species like bearded dragons, uromastyx, and blue-tongued skinks that are naturally exposed to intense, unfiltered sunlight. At 25W, it produces significantly more UVB than the tropical bulb, penetrating deeper into the enclosure and remaining effective even through dense screen covers. The desert spectrum simulates the harsh, open conditions of arid environments, supporting natural behaviour, appetite, and calcium metabolism. At £42.45, it's £3.87 more than the tropical option — a small premium for a meaningfully more powerful output.
Best for: Desert reptiles (bearded dragons, uromastyx, skinks), larger enclosures, screened terrarium lids.
Wattage: 25W | UVB type: Desert / UVB 150 high output | Key benefit: Deep-reaching UVB, calcium metabolism, screen-compatible | Pairs with: Repti-Glo 2.0 for visual light
3. DERNORD Reptile Heat Mat with Digital Thermostat – 8W Under Tank Heater
£47.96
The DERNORD Heat Mat with Digital Thermostat addresses the other critical environmental need: heat. Unlike UVB bulbs, a heat mat provides belly heat — the kind of warmth reptiles absorb from sun-warmed ground in the wild, essential for digestion and thermoregulation. The digital thermostat is the key feature here: it lets you set precise temperatures between 68–108°F (20–42°C) via a simple 3-button interface, eliminating the guesswork and overheating risk that comes with uncontrolled heat mats. The 8" x 6" mat can be mounted on the bottom or side of the tank, and the upgraded adhesive material resists melting and separation for long-term reliability. At £47.96, it's the most premium product in this trio — and the most complete, as it includes both the mat and the controller.
Best for: Snakes, bearded dragons, lizards, any reptile needing belly heat; owners wanting precise temperature control.
Wattage: 8W | Temperature range: 68–108°F (20–42°C) | Mat size: 8" x 6" | Mounting: Bottom or side | Includes: Mat + digital thermostat
Side-by-Side Comparison
| Feature | Exo Terra Tropical UVB | Exo Terra Desert UVB 150 | DERNORD Heat Mat + Thermostat |
|---|---|---|---|
| Price | £38.58 | £42.45 | £47.96 |
| Function | UVB lighting | UVB lighting (high output) | Belly heat + temperature control |
| Wattage | 13W | 25W | 8W |
| Best Species | Tropical (chameleons, geckos) | Desert (bearded dragons, skinks) | Snakes, lizards, most reptiles |
| Temperature Control | ❌ (lighting only) | ❌ (lighting only) | ✅ Digital thermostat included |
| Screen Compatible | Standard | ✅ Optimised for dense screens | N/A (under tank) |
| Prevents | Metabolic bone disease | Metabolic bone disease | Overheating / cold stress |
| Includes Controller | ❌ | ❌ | ✅ Digital thermostat |
What Does Your Terrarium Need?
The honest answer for most reptile keepers is: all three, or at least two. UVB lighting and belly heat serve completely different functions — one provides the light spectrum for vitamin synthesis, the other provides the warmth for digestion and thermoregulation. They're not interchangeable.
For the lighting choice, it comes down to your species. If you keep tropical reptiles in a rainforest-style setup, the Exo Terra 13W Tropical UVB at £38.58 is the right calibration. If you keep desert species like bearded dragons in a larger enclosure with a screen lid, the Exo Terra UVB 150 Desert Bulb at £42.45 is the more powerful option that will penetrate further and perform better through dense covers. And regardless of which UVB bulb you choose, the DERNORD Heat Mat with Digital Thermostat at £47.96 is the safest, most precise way to provide the belly heat your reptile needs — the included thermostat is a genuine safety feature that prevents dangerous temperature spikes.
Browse all three and more in our Reptile & Amphibian Supplies collection.
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