Lighting is the single most important part of bearded dragon care — it controls digestion, bone health, activity, and even mood. A bearded dragon needs three things from its lighting: heat, UVB, and a proper day/night cycle.
This guide ties it all together: what lights you need, how to arrange them, and the daily schedule to follow.
The Three Components of Bearded Dragon Lighting
| Component | Purpose | Product type |
|---|---|---|
| Basking / heat lamp | Creates the hot basking spot (95–110°F) | Halogen or incandescent bulb |
| UVB light | Enables vitamin D3 + calcium absorption | T5 or T8 10.0 tube |
| Night heat (optional) | Keeps temps above 65°F at night | Ceramic heat emitter (no light) |
How to Arrange the Lights
- Put heat and UVB on the same side (the basking side). Your dragon should get both at once while basking — this mimics natural sunlight.
- Position the UVB tube so it covers about two-thirds of the enclosure, over the basking area.
- Check the distance: a T5 tube is usually mounted 10–15 inches from the basking spot (see your bulb’s instructions).
- Leave the cool side darker and cooler (75–85°F) so your dragon can retreat and thermoregulate.
The Ideal Daily Light Cycle
| Time | Setting |
|---|---|
| Day | Heat + UVB on for 12–14 hours |
| Night | All lights off for 10–12 hours (darkness is important for sleep) |
Use a timer to keep the cycle consistent — a simple plug-in timer is cheap and removes the “forgot to turn the lights on” problem entirely.
UVB Replacement Schedule (Don’t Forget)
- T5 tubes: replace about every 12 months.
- T8 tubes: replace about every 6 months.
UVB output fades over time even though the bulb still glows. Set a reminder, because “the light still works” doesn’t mean “the UVB is still there.”
Common Lighting Mistakes
- Using a coil UVB bulb — too weak and uneven. Use a tube.
- Putting UVB on the cool side — your dragon won’t get enough UVB.
- Blocking UVB with glass or plastic — both filter out UVB. Mount inside or over mesh (and account for mesh blocking some UVB).
- Using a heat mat instead of a lamp — dragons need overhead heat.
- Leaving lights on 24/7 — dragons need darkness to sleep, like we do.
- UVB: Arcadia ProT5 12% or Zoo Med ReptiSun T5 10.0
- Heat: Zoo Med Repti Basking Spot Lamp or Fluker’s Basking Bulb
- Night (if needed): ceramic heat emitter on a thermostat
- Control: plug-in timer + a dimming thermostat (optional but recommended)
Recommended Lighting Setup
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Disclaimer: This guide is for general education and does not replace professional veterinary advice.
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