Bearded dragons need a temperature gradient so they can thermoregulate by moving between warmer and cooler zones. A common target for juveniles and healthy adults is a basking surface around 100 to 110 degrees Fahrenheit measured with a digital thermometer or temperature gun on the rock or branch directly under the lamp, not just the air a few inches away.

The cool end of the enclosure is often kept in the mid-70s to low 80s Fahrenheit during the day. Night temperatures can dip into the 65 to 70 range for many adults as long as the dragon is healthy and the room is stable; very young dragons or sick animals may need gentler overnight lows.

Ceramic heat emitters, deep heat projectors, and well-controlled halogen-style basking bulbs are common tools, but any heat source must connect to reliable thermostats or dimmers where appropriate and be guarded so the animal cannot touch hot elements. Avoid unguarded heat rocks, which cause severe burns.

Ultraviolet-B lighting is a separate requirement from heat. A dragon can sit at a perfect basking temperature and still develop metabolic bone disease without appropriate UVB exposure and dietary calcium balance. Follow manufacturer replacement schedules for UVB bulbs because output fades before visible light dies.

If your dragon stays in the cool corner constantly, gapes with mucus, has dark stress marks, or stops eating, check temperatures at both ends, verify lamp placement, and schedule a reptile veterinarian visit to rule out respiratory infection, parasites, or pain.

Always confirm targets with a herp-savvy veterinarian, as individual needs shift with brumation plans, illness, and outdoor supervised basking setups.