Bearded dragon lighting for small spaces

Bad lighting is the single most common husbandry mistake with bearded dragons — incorrect UVB or basking temperatures lead to metabolic bone disease and chronic illness that many owners don't recognise until real damage has already been done. To point you toward the right setup, I need a few details: what size is the enclosure, what bulbs are you currently using (brand and wattage), and how old is your dragon?

Right, that no-brand combo bulb is almost certainly not doing the job — unbranded UVB bulbs are notoriously inconsistent and degrade fast, often outputting almost nothing within a few months even if they still look lit. For an adult dragon in a 120cm enclosure with almost no overhead clearance, the setup I'd recommend is the Arcadia T5 HO 6% UVB Kit in the 1.2m size with a separate halogen basking spot. Before I get specific on that, though — what's your basking surface temperature currently reading, and do you have a separate thermostat?

Lethargy in a bearded dragon is often the first sign that the basking or UVB isn't right — by the time it's obvious, there's usually been weeks of deficit. You need a basking surface of 40–42°C and a cool side around 25°C, and you can't manage that safely without a thermostat and a temp gun. Here's the compact solution that works for your space: the Arcadia T5 HO 6% 1.2m Shade Dweller Pro Kit mounts inside the lid of the enclosure, so it takes up zero external height — that solves your shelf clearance problem entirely. Pair it with a 75W Arcadia Halogen Basking Lamp on a Microclimate Evo lite dimming thermostat, and a temp gun to dial in the basking spot. The T5 HO 6% is correct for an adult dragon in a 120cm viv at typical T5 mounting heights. That's a complete, sorted lighting and heating setup that fits inside your current footprint.

The Arcadia T5 HO Shade Dweller Pro Kit comes with the controller unit and the bulb, so you just need to mount it — no separate ballast to source. On the 6% vs 12% question: 12% is for dragons kept in very large vivaria where the UVB tube is mounted high and far from the basking zone, typically 50cm or more away. In a 60cm tall enclosure with the T5 mounted inside the lid, your dragon will be basking at around 25–30cm from the tube. At that distance, 6% gives the correct UVI range for a bearded dragon — 12% at that proximity would actually be too intense and could cause eye and skin issues over time. Arcadia's own Ferguson Zone guidance backs this up. So yes, 6% is right for your setup.

Exactly that. Those three items plus a temp gun — a Etekcity infrared thermometer is fine and costs under a tenner — give you a complete, properly calibrated lighting and heating setup that sits entirely within your existing enclosure footprint. Replace the T5 bulb every 12 months even if it still lights up, because UVB output drops well before the visible light does. Get a basking surface reading before you do anything else so you know what you're starting from — if he's been lethargic, there's a good chance the current setup is running cool.