Do crested geckos need UVB?

Short answer: A crested gecko can survive without UVB, but ReptiFiles recommends it for all reptiles because a growing body of evidence shows UVB improves health and quality of life. Nothing strong is needed: an 18 inch 6% (or 5.0) linear UVB bulb with a reflector, on for about 14 hours a day in summer and 10 in winter.

Written from the cited care and veterinary sources below. No AI-written care advice.


Needed?	Recommended, not strictly required
Bulb	18 in 6% or 5.0 linear UVB with a reflector
Day length	About 14 h in summer, 10 h in winter

Crested geckos typically hide behind leaves during the day, and the light also helps set their daily and seasonal rhythms, activity and appetite. The rest of the setup, with each number’s source, is on the crested gecko care sheet.

Check your crested gecko's setupOpen the calculator →

Questions

Is UVB necessary for crested geckos?

Not strictly. Going without UVB won't necessarily kill a crested gecko, but ReptiFiles recommends it because a growing body of evidence shows it improves health and quality of life.

What UVB bulb should I use for a crested gecko?

A low-output linear bulb such as an 18 inch 6% or 5.0 tube with a reflector, for example an Arcadia ShadeDweller or a Zoo Med 5.0.

How many hours of light does a crested gecko need?

About 14 hours a day in summer and 10 in winter.

Sources

General information, not veterinary advice. To find a reptile vet, use the ARAV directory. Updated November 9, 2026.