Senior bearded dragon basking temperature advice

Ten years is a genuinely impressive age for a bearded dragon — you've clearly been doing something right. Bad lighting is the most common husbandry mistake with beardies, and incorrect UVB or basking temperatures cause metabolic bone disease and chronic illness that many owners don't recognise until significant damage has already been done. At this age, the question of whether to dial things back a little is exactly the right one to be asking. To give you a precise answer, can you tell me: what size is the enclosure, what UVB and basking bulbs are you currently running (brand and wattage), and has your dragon shown any changes in behaviour or appetite recently?

Good news — the T5 6% is a solid UVB choice and a 4x2x2 is a proper-sized enclosure, so the fundamentals are sound. The slowing down is very likely age-related rather than a husbandry problem, but it does actually change what you want from the basking spot. Younger dragons need a basking surface temperature of around 40–43°C to digest efficiently and stay active. At ten years old, a dragon's metabolism has slowed and their thermoregulation becomes less precise — they often do better with a slightly gentler basking gradient, something in the 38–40°C range at the hotspot, with the cool end staying around 24–26°C. This reduces the thermal stress on organs that have been working hard for a decade. The key thing is not to drop the temperature dramatically — just take the edge off the peak and make sure the gradient across the enclosure is clean so he can choose his own comfort level.

Dropping wattage is part of it, but the smarter move is switching to a halogen flood rather than a standard reptile basking bulb. I'd recommend the Arcadia Halogen Basking Flood — the 50W version. It produces a broader, more diffuse heat spread than a narrow basking spot bulb, which means your dragon doesn't have to sit in one precise position to thermoregulate. For an older animal with potentially stiffer joints and slower movement, that wider warm zone is genuinely more comfortable and safer. It also tends to run cooler at the surface than an equivalent standard bulb, which helps you land in that 38–40°C sweet spot without a dimmer. Check the surface temperature with a temperature gun once it's set up — that's non-negotiable at his age. You want to measure the actual basking surface, not the air temperature.

The Reptile Systems 6% T5 you're using is actually well-suited to a senior dragon. You'd only consider moving to a higher index like 12% if he were showing signs of metabolic bone disease or spending significantly less time basking — some older dragons do bask less, which means they're getting less UVB exposure even with the same bulb. The more important thing to check is the bulb's age. T5 UVB tubes lose their UV output before they visibly dim — most manufacturers rate them at 12 months, some at 14. If yours is older than that, replace it regardless of how bright it looks. A ten-year-old dragon with compromised UVB absorption is much more vulnerable to bone density loss than a younger animal would be.

At ten years, the main things to watch are: sudden weight loss even with normal appetite, any swelling around the jaw or limbs, and changes in stool consistency. Annual vet checks with a reptile-specialist vet are worth doing at this age — bloodwork can catch kidney issues early, which are common in older beardies. But honestly, a dragon eating well, living in a proper enclosure with decent UVB, and getting a gentler basking gradient is in a very good position. The Arcadia 50W halogen flood, a temperature gun check once it's in, and keeping an eye on that UVB bulb replacement schedule — that's your setup sorted.