Lighting three bearded dragon hatchlings equally

Three hatchlings at six weeks — you're at exactly the age where lighting mistakes set the trajectory for the next decade of their lives. Bad lighting is the single most common husbandry error with bearded dragons, and at this stage metabolic bone disease can take hold silently before you see any symptoms. To make sure I point you toward the right setup for all three, can you tell me: what size enclosures are you housing them in, what UVB and basking bulbs are you currently running or planning to use, and are all three in separate enclosures or together?

Perfect — starting fresh means you avoid the usual problem of correcting bad habits. For a 3x1.5 foot enclosure, you need a T5 HO UVB tube covering at least two-thirds of the length, paired with a separate basking spot. What you want for hatchlings is a Ferguson Zone 3 UVB output — around 6% UVB — which means the Arcadia 6% T5 is exactly right. Avoid T8 tubes entirely at this stage; they don't produce enough UV index at a safe mounting distance. Are you planning to run all three setups identically, and do you have a thermostat or temperature gun to verify basking temps?

For hatchlings you want the basking surface hitting 42–45°C measured directly with that gun — not air temp, surface temp. The cool side should sit around 28–30°C. Now, for your three enclosures, my clear recommendation is the Arcadia ProT5 Kit — Dragon 6% — in the 24 inch size. It comes with the reflector hood, a 24W 6% T5 HO tube, and a starter unit, so every single component is identical across all three setups right out of the box. The reflector makes a significant difference to UV penetration at hatchling basking distances. Pair each one with a 60–75W halogen flood bulb — standard hardware store PAR38 or similar — on a dimmer plug to dial in that surface temp precisely. Avoid mercury vapour bulbs at this size enclosure; they're overkill and harder to control.

With the Arcadia 6% T5 and the reflector hood that comes in the ProT5 kit, mount it inside the enclosure if you have a mesh top — not on top of it. Mesh blocks roughly 30–50% of UV. At 25–30cm from the basking surface you'll be in the correct UV Index range for hatchlings without the reflector being on top of mesh. You don't strictly need a Solarmeter to get started if you follow those distances exactly and use the correct tube — the Arcadia 6% is well-characterised and the distances are documented. That said, if you're comparing three dragons over time and want to be rigorous about it, a Solarmeter 6.5 is the gold standard and worth having. Replace the tubes at 12 months regardless of whether they still produce visible light — UV output drops well before the tube dims.

Yes — run a 14-hour light and UV cycle for hatchlings, dropping to 12 hours once they're past six months. A simple plug-in mechanical timer per enclosure works perfectly; no need for anything fancy. Keep both the UVB and basking on the same timer so they come on and off together — hatchlings regulate their UV exposure by moving between the basking spot and the cool side, and they need both available simultaneously to do that properly. You're set up to give all three a genuinely equal start, which means any differences you see in growth will be meaningful rather than artefacts of inconsistent husbandry.