This is a specific conversation about Reptile heating and lighting — the critical factors — ask about yours and get one honest answer for your exact situation.
inparticular.ai
A six-week-old Greek tortoise is one of the most rewarding setups to get right from the very beginning — and at that age, the margin for error is smaller than with adults. Getting heating and UV lighting correct is honestly the single most important thing you can do for a hatchling; metabolic bone disease, poor shell development, and respiratory infections are almost always rooted in lighting or temperature problems. What size tortoise table are you working with, and do you have anything in place already — even a basic bulb or lamp?
I've got a 90cm tortoise table, nothing in it yet. I want to do it properly from day one. I've read a lot about UV but I'm confused about the percentage — some say 5%, some say 10%, and I don't want to burn a tiny hatchling.
inparticular.ai
You're right to question that — it matters a lot at this age. For a hatchling Greek tortoise, you want a UVI (UV Index) of around 2.9 to 3.1 in the basking zone, which equates to a Ferguson Zone 3 species. A 6% T5 tube is the correct choice here, not 12%. The Arcadia T5 12% is excellent for adults but genuinely too intense for a six-week-old at close range. What's the distance from your lamp fixture to the basking spot going to be? That changes the exact recommendation slightly.
I was planning to mount the lamp about 30 to 35cm above the substrate.
inparticular.ai
Perfect — at 30 to 35cm, the Arcadia Forest 6% T5 HO is exactly what I'd recommend. It delivers the right UVI range at that height without any risk of UV burn on delicate hatchling skin and developing scutes. Pair it with a simple 40W halogen flood spot for your basking heat — aim for a basking spot of around 30 to 32°C and a cool end of 20 to 22°C. No ceramic heat emitters, no high-wattage bulbs — hatchlings need gentle, graduated warmth, not intense heat. The Arcadia Forest 6% T5 HO is widely available on Amazon UK in a 24-inch size that suits a 90cm table well.
Should I be running the UV and heat on a timer at this age, or leaving it on longer because they're so young?
inparticular.ai
Timer is essential — don't leave it running continuously. Aim for a 10 to 12 hour photoperiod, so UV and basking heat on together for 10 to 12 hours, then off completely. Hatchlings need a clear day-night cycle to regulate their metabolism properly. Running lights too long actually stresses them and disrupts natural behaviour. A simple plug-in timer set to match morning to early evening is all you need. Make sure the UV and basking come on at the same time — they should always be available together, not separately.
That makes sense. One more thing — do I need any supplemental heating overnight if my room drops to around 17 or 18 degrees?
inparticular.ai
At 17 to 18°C overnight you're in a borderline zone. Greek tortoises are from Mediterranean climates and do experience cool nights naturally, but for a hatchling this young I'd bring it up slightly — aim for no lower than 18 to 20°C in the enclosure overnight. A low-wattage heat mat set under one side of the table, on a thermostat, will handle that without disrupting the dark cycle. No light output, no UV — just gentle background warmth. A Habistat mat stat set to 19°C will do the job cleanly and safely.
