21/09/2026
Arcadia 12% & 14% UVB Output Guides 💡
UVB can be confusing, especially when trying to work out what percentage tube to use and how far it should be from your reptile.
I’ve put together these guides using readings I’ve taken from Arcadia 12% & 14% T5 UVB tubes, both with and without an Arcadia reflector, to show how much the UVI can change with distance.
These readings are a guide only, the right UVB percentage and distance will depend on the species you’re keeping, enclosure setup, basking position, mesh and reflector being used.
I also like to recommend replacing UVB tubes every 12 months. While some tubes can continue producing UVB for longer, it’s an easy thing to forget about, so having a regular yearly replacement schedule makes it much easier to keep on top of. I personally like changing mine at the beginning of spring, so the tube is producing its strongest output heading into summer, when many reptiles would naturally experience higher levels of UV exposure.
If you’re unsure which UVB tube or distance is right for your reptile, feel free to message TJM REPTILES I’m always happy to help. 🙂
I’m thinking about doing more educational posts like these to share some of the things I’ve learnt over the years and hopefully help other reptile keepers along the way. 💚🐍
