Crested gecko UVB setup

Is UVB required?

Not strictly. A crested gecko can live on a high-quality prepared diet without UVB, and the published guidance says as much - and then recommends UVB for all reptiles including crested geckos, on the grounds that there is a growing body of evidence it substantially increases health and quality of life for species previously thought not to need it. There is also the UVA argument: UVB bulbs emit UVA, which reptiles perceive as an additional color.

The full answer is on the dedicated page. This page is about how to set it up.

The distances

The measurement is to the branch, not to the substrate. That sounds obvious and is the most common error in an arboreal setup, because the gecko's resting position may be 20 inches above the floor. It also means the distance changes whenever you move the hardscape - which is a reason to take a reading after rearranging rather than assuming the setup is unchanged.

Photoperiod

14 hours in summer, 10 hours in winter, preferably with gradual transitions in between. This helps regulate circadian rhythms and seasonal cycling and improves activity, appetite and overall health. The seasonal swing for this species is large - 14 hours down to 10 - and it costs nothing but a timer.

Nothing at night

The guidance is direct: do not bother with black, blue or red light bulbs for night viewing or supplemental heat. Crested gecko eyes function perfectly in the dark, and providing light at night can disrupt the day-night rhythm. Nightly temperature drops are healthier than providing heat at night anyway.

The rules that apply to every lamp

• No glass or plastic over the lamp - both block UVB completely.
• Linear tube for an adult; the hatchling compact bulb is a specific exception.
• Replace the tube every 12 months regardless of visible output.
• Measure to the resting position, not to the floor.