Bearded dragon lighting with hepatic lipidosis

Bad lighting is the most common husbandry mistake with bearded dragons — incorrect UVB output or basking temperatures cause metabolic bone disease and chronic illness that many owners don't recognise until significant damage is done. With hepatic lipidosis already in the picture, getting lighting absolutely right matters even more: proper D3 synthesis and thermoregulation both support liver function and overall metabolic health. To point you to the right setup, can you tell me the size of your enclosure, what bulbs you're currently running (brand and wattage), and how old your dragon is?

That T8 setup is almost certainly underperforming — unbranded T8 tubes typically output far less usable UVB than they claim, and at 2 years old in a 4x2x2 she needs consistent, measurable UVB across the full basking zone. For a dragon managing mild hepatic lipidosis, efficient D3 synthesis is genuinely important: her liver is already under stress, and if she's compensating with poor calcium metabolism that adds another burden. What's the distance from the tube to where she basks, and is she showing any signs of lethargy, reduced appetite, or anything beyond what the vet already picked up?

At 30cm a quality T5 HO tube makes a real difference over T8 — the UVB output at that distance is substantially higher and far more consistent. My clear recommendation is the Arcadia Dragon D3+ 12% T5 UVB tube in the 39W size, which covers your 4-foot viv properly. Arcadia is the most trusted UVB brand in the UK reptile hobby, the 12% output is specifically calibrated for dragons in the Ferguson Zone 3 they occupy, and at 30cm it puts her in the correct UVI range of 4–6. For basking, swap the 75W halogen for a 100W Arcadia Halogen Flood — halogens produce a tighter, more intense heat spot that better replicates sun basking, and the warmer basking surface (52–55°C surface temp) supports digestion, which matters directly for a dragon with liver stress. The T5 tube is the priority change.

Not dramatically differently, but a few things are worth being deliberate about. Keep a consistent 12-hour photoperiod — disrupted light cycles add low-level physiological stress that a compromised liver doesn't need. Make sure she has a genuine cool end around 28°C so she can thermoregulate down when she needs to; dragons with liver issues sometimes seek cooler areas more often, and restricting that choice forces the liver to work harder. Replace the T5 tube every 12 months even if it still glows — UVB output degrades well before visible light does, and an expired tube producing no usable UVB is the exact scenario that would make her situation worse quietly over time. Otherwise the setup for a healthy 2-year-old is the right target: you're not managing the liver condition through lighting, you're just removing any additional burden.

The cleanest option is the Arcadia ProT5 Lighting Kit, which includes the controller unit, reflector, and the Dragon D3+ 12% tube together. The reflector alone roughly doubles usable UVB at basking distance compared to running the tube without one — it's not optional for a proper setup. If you already have a compatible T5 controller you could buy the tube separately, but most people using unbranded T8 setups don't, and the kit is better value than buying components individually. That single swap from your current T8 to the Arcadia ProT5 kit will be the most meaningful improvement you can make for her right now.