UVB for 2-week-old bearded dragon hatchling

Bad lighting is the single most common husbandry mistake with bearded dragons — incorrect UVB or basking temperatures cause metabolic bone disease and chronic illness that many owners don't recognise until significant damage is already done. With a hatchling that's only two weeks old, you're asking exactly the right question: their eyes and skin are more sensitive than an adult's, but they still need proper UVB from day one or bone development suffers immediately. To give you the right recommendation I need a few details — what size is the enclosure, what bulb are you currently using (brand and wattage if you know it), and has the hatchling been eating and behaving normally so far?

Good instinct to check this. The concern about eye damage from 10% UVB specifically is slightly overstated as a risk when the tube is a low-output T8 — because cheap unbranded T8s typically underperform their labelled percentage significantly, the actual UV index at basking level is usually modest. That said, unbranded T8 tubes are still the wrong tool: they degrade rapidly, their output is inconsistent, and you genuinely can't trust what they're emitting. The bigger risk isn't burning the eyes — it's that your hatchling gets far less UVB than they need and starts developing soft bones before you notice anything visible. One more question: is the UVB tube mounted inside the enclosure or sitting on a mesh lid above it?

That's important — mesh blocks a meaningful percentage of UVB, so even a decent bulb loses roughly 30–50% of its output before it reaches the dragon. For a hatchling in a 90cm enclosure with a mesh lid, the right answer is the Arcadia T5 HO 6% Dragon Lamp, 39W in the 865mm length to cover the enclosure properly. Here's the reasoning: Arcadia's 6% T5 HO is specifically designed for forest and younger desert species — it produces a UV index of around 1–2 at 30–40cm distance, which is appropriate for a hatchling and stays safe even through mesh. The 6% rather than 12% gives you a gentler gradient, the T5 HO format delivers reliable, consistent output you can actually trust, and Arcadia publish their UV data independently so you're not guessing. Pair it with an Arcadia T5 HO controller strip if you don't already have one. Position your basking spot so the dragon sits roughly 30–35cm below the tube, and you'll have safe, effective UVB without any eye risk. Replace the tube at 12 months regardless of whether it still looks lit — UVB output drops long before visible light does.

Two weeks on a low-output T8 is not ideal, but it's unlikely to have caused measurable metabolic bone disease if the hatchling is eating well and moving normally. Early MBD in hatchlings shows up as tremors, a soft or curved jawline, and reluctance to bear weight on the front legs — if you're not seeing any of that, you've caught it in time. Swap to the Arcadia 6% T5 HO now, make sure your basking spot sits between 40–42°C, and ensure the dragon is getting appropriately dusted feeders with calcium and D3 supplement two to three times a week. If you have any doubts, a reptile vet can do a quick physical assessment — but based on what you're describing, getting the lighting right now is the priority and the prognosis is good.

Good move. Get the 865mm 39W version to properly cover the enclosure, and pick up the Arcadia ProT5 controller strip if your kit didn't come with a suitable fitting — using it with a non-compatible ballast can shorten the tube life and affect output accuracy. Once it's installed, do a quick check with a UV index meter if you can borrow or buy one cheaply; it takes the guesswork out completely. Your hatchling is at a critical growth stage right now and you're doing the right things — good lighting at this age makes a real difference to the animal's long-term health.