How Often To Replace UVB Bulb
without the guesswork.
Reptile UVB Bulb Decay Replacement Calculator — Track an exact lamp-label date while letting faults, UV meter readings and enclosure changes override the calendar. Includes a practical guide and embedded calculator. Inputs stay in your browser.
The calendar follows the exact selected manufacturer label or a custom interval. A physical fault, low measured UV or enclosure-layout change overrides a date-only reminder.
Context matters.
- Do not use one lamp model's lifespan, distance chart or UV percentage for a different product; choose custom when the exact preset does not match.
- Mesh, reflectors, fixture type, distance and lamp orientation change the UV delivered at the animal's basking site.
- Use a reptile veterinarian or current species care plan for the target UV Index, and follow electrical-safety and mercury-lamp disposal instructions.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
Can I choose a 12-month preset for any UVB lamp?
No. The presets apply only to the exact named product lines. Choose custom and copy the current product-label interval for any other lamp.
Why can a UV meter override the date?
The animal receives UV at the basking site, not at the bulb. A below-target reading can reflect lamp output, distance, mesh, fixture or orientation and needs investigation now.
Does visible brightness show that UVB is still adequate?
No. A lamp can still look bright while UV output has changed; use the product label and, when appropriate, a suitable meter and species care plan.