Red-footed tortoise UV needs at 18 months

Getting heating and UV lighting right is the single most important factor in reptile health — most common illnesses, including metabolic bone disease and respiratory infections, trace directly back to incorrect lighting or temperature. At eighteen months your red-footed tortoise is transitioning out of the most fragile hatchling stage, and UV requirements do shift as they grow. To give you the most accurate advice: what size enclosure are you using, and what lighting and heating do you currently have set up?

You've read correctly — red-footed tortoises are a forest species that naturally lives under a broken canopy, so they don't need the intense UV that a desert tortoise like a Hermann's would require. The Ferguson scale puts them in Zone 2, which means a 6% UVB output is actually the right target rather than 10%. Here's the issue though: a compact bulb of any percentage is the wrong format for a 4x2 table at this stage. Compact bulbs have a very short effective range — around 20–25cm — and they don't provide even coverage across a table that size. At eighteen months your tortoise is moving around that full footprint and may be spending most of her time well outside the useful UV zone without you knowing it.

Yes, switch to a T5 linear tube. The specific bulb I'd recommend is the Arcadia T5 HO 6% Forest Bulb — it's designed exactly for forest-dwelling reptiles including red-footed tortoises, it puts out the right UV index at the correct intensity for Zone 2 species, and the T5 format gives you even coverage across the length of the table. For a 4x2 table, go with the 39w 34-inch version, which covers most of the enclosure length. Pair it with an Arcadia T5 controller unit or a compatible reflector hood — the reflector roughly doubles the usable UV output, which matters because your tortoise needs to be able to thermoregulate without constantly sitting directly under the lamp.

For a sub-adult red-foot, you want a basking spot of around 32–35°C, with the cool end sitting at 22–26°C. Whether your 60w bulb achieves that depends on the ambient temperature of the room. Measure the actual surface temperature under the basking bulb with an infrared thermometer rather than guessing from the wattage — that's the only reliable method. If the spot is hitting 32–35°C, your current bulb is fine for now. The UV upgrade is the more pressing change to make. Red-footed tortoises are also more humidity-tolerant than Mediterranean species, so if the wooden table is drying out quickly, adding a shallow humid hide on the cool end makes a real difference at this age.

Exactly right. Ten to twelve hours is the standard photoperiod for red-footed tortoises and works well with the Arcadia T5 6% Forest bulb. One important maintenance note: T5 bulbs lose UV output before they visibly dim, so replace it every twelve months even if it still looks bright. At eighteen months your tortoise is in an active growth phase and consistent, correct UV exposure now is what prevents metabolic bone disease later — this is genuinely the most impactful change you can make to her setup.