FAQ: Heating & Lighting for reptiles

The basking surface usually warms within half an hour to an hour, and the whole terrarium takes somewhat longer depending on its size and material. That is why temperatures are best measured at least an hour after the lamp comes on.

A flat stone, slate slab or tile under the basking lamp stores heat and lets the reptile warm up from above and below. Measure its surface temperature before use, as a dark stone can get hotter than you might expect.

Yes, a hide on the warm side is recommended so the reptile can stay warm and feel safe at the same time. If hides are only on the cool side, the animal may choose safety over warmth and stay too cool for long.

Hognose snakes usually need a warm zone at one end and a cooler side, and since they like to burrow, overhead heat often works better than a mat under thick substrate. Heating is always thermostat-controlled and temperatures are checked at the animal’s level.

Kingsnakes usually do well with moderate heating, a warm zone and room temperature on the cool side. A basking lamp, ceramic heater or mat on a thermostat all work, and the heaters must be protected from direct contact.

African fat-tailed geckos are nocturnal and like a warm, somewhat more humid environment than leopard geckos. They do well with a warm zone from a mat or lamp on a thermostat, a humid hide and a cooler side.

Russian tortoises need a hot basking spot, a strong UVB lamp and a dry environment with a cooler zone. Since they dig burrows, it helps to have enough deep substrate in the cooler part of the enclosure.

Indoors Hermann’s tortoises need a basking lamp that warms the whole shell, a UVB lamp and a cooler zone with a hide. In warm weather they benefit from time in a safe outdoor pen where they get natural sunlight.

Musk turtles spend most of their time in water, so a thermostat-controlled water heater is important, but they also need a basking spot and a UVB lamp over the platform. The platform must be easy to reach, as these turtles are poor swimmers in deep water.

Box turtles need a warm basking spot, a UVB lamp and a humid environment with a cooler zone and a shallow water dish. Since they like humidity, the heating must not dry the substrate out too much.

Monitors usually need a very hot, wide basking spot, strong UVB and a large enclosure with a clear temperature gradient. Several powerful lamps are often used for large monitors, and exact needs vary a lot between species.

A spot bulb creates a small but hot basking area, so it suits smaller reptiles or low terrariums. A flood bulb heats a larger area and suits big lizards or tortoises that need their whole body warmed.

In tall terrariums heat rises, so the basking spot is set up at the top on a branch while the bottom stays cooler. The lamp must be at a height where the reptile on the highest branch cannot touch it or overheat.

Mesh enclosures are well ventilated but lose heat quickly, so in a cool room it is hard to hold the right temperature in them. In that case a stronger basking lamp or a warmer room may be needed, and temperatures must be watched especially closely.

Heating dries the air, so for tropical species a larger water bowl, a moisture-holding substrate, regular misting and a partly covered mesh lid help. Do not overdo it, as a warm, damp terrarium without ventilation encourages mould.

No, foggers and humidifiers only raise humidity, and some even cool the air slightly. They are best run on a timer or humidity controller and used alongside normal heating.

Yes, if the mat is covered by thick substrate or has a heavy rock on it, heat builds up and the glass can heat unevenly and crack. Use the mat with a thermostat, leave an air gap between it and the stand and do not put thick insulating layers over it.

A failed mat may stop heating or heat only part of its surface, or sometimes the opposite, overheat in spots. Regularly measure the surface temperature above the mat, and switch it off at once if you notice discolouration, bulging or a damaged cable.

A very bright lamp in a terrarium that is too small can be too close to the animal, and the reptile may avoid the bright zone. In that case a lower-wattage bulb or a larger terrarium is better, so enough shade remains.

It is worth having a spare basking bulb and, if possible, a spare thermostat or thermometer, as they usually fail unexpectedly. This matters especially in winter, when a few days without heating can leave the reptile too cold.