This is a specific conversation about Bearded dragon lighting — UVB and basking done right — ask about yours and get one honest answer for your exact situation.
inparticular.ai
Bad lighting is honestly the 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 real damage has already been done. So the fact that your fixture breaking is prompting an upgrade is genuinely good news. Before I point you in the right direction: what size is the enclosure, what bulbs were you running before (brand and wattage if you know them), and how old is the dragon?
It's a 4x2x2 enclosure. I was using a cheap 75w PAR38 flood bulb from a pet shop, no brand really. Dragon is just over a year old. I want to switch to something that works with a dimming thermostat so I can keep the basking spot consistent.
inparticular.ai
Good setup size for a one-year-old — plenty of space for a proper thermal gradient. The PAR38 flood bulbs are a common starting point but they're not ideal for thermostat control; they can flicker or fail early when dimmed. The right move here is switching to a halogen heat lamp, which dims cleanly and safely. What basking surface temperature were you hitting before, and do you have a digital thermometer or temperature gun to check it? I want to make sure the wattage I suggest will actually hit the right spot.
I have a temperature gun. Honestly it was running a bit hot — around 45°C on the basking spot. I think 40–42°C is where I should be for an adult. I don't have a dimming thermostat yet, planning to buy one alongside the bulb.
inparticular.ai
45°C is too high — you want the basking surface at 40–42°C for a dragon this age, so dialling that back will be a genuine improvement. For your 4x2x2, I'd go with the Arcadia Halogen Heat Lamp 75W. It's a true halogen reflector bulb designed specifically for reptile basking use, dims smoothly with a quality dimming thermostat without any flickering, and produces a tight focused basking spot rather than flooding the whole enclosure with heat. Pair it with the Inkbird ITC-306A dimming thermostat — it's reliable, accurate to within a degree, and widely used by serious keepers. Set the probe on the basking surface and let the thermostat do the work. You'll hit 40–42°C consistently without manually fiddling with height or wattage.
That sounds straightforward. Do I need to change the UVB setup at the same time, or is that separate?
inparticular.ai
Separate question, but an important one — what UVB are you currently running? For a 4x2x2 the standard recommendation is an Arcadia T5 HO 12% tube covering at least two-thirds of the enclosure length, mounted inside the lid with no mesh between the tube and the dragon. If you're already doing that, you're fine to just sort the basking side now. If you're running a coil compact bulb or an older T8 tube, that's worth fixing at the same time because a one-year-old dragon needs strong, consistent UVB to keep building bone density properly.
I have an Arcadia T5 HO 12% already, about 8 months old. So that should be fine for now?
inparticular.ai
That's exactly right. T5 HO 12% tubes are rated for 12 months of effective output, so at 8 months you've got a couple of months left before you need to replace it — mark the date on the tube so you don't forget. For now, focus on the Arcadia 75W halogen and the Inkbird dimming thermostat, get that basking spot locked in at 40–42°C, and you'll have a genuinely solid setup for your dragon.
