Mourning Gecko Heating and Lighting

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Mourning gecko heating starts with the animal’s origin. Lepidodactylus lugubris comes from tropical Southeast Asia. It has also spread across most warm Pacific islands, including Hawaii.

The Reptiles of Ecuador account describes it as primarily nocturnal. It lives in lowland habitats from rainforest to plantations, and thrives on the walls and ceilings of buildings near electric lights.

That native climate sets the temperature and light targets below. It is not a generic reptile chart built for a desert species.

The species is also unusual among pet geckos. It reproduces by parthenogenesis, so nearly every pet in the trade is a genetically identical female.

That biology is covered on the mourning gecko breeding page. It matters here too. Egg laying slows once conditions cool, which ties reproduction to the temperatures in this guide.

Daytime and Basking Temperatures

Good mourning gecko heating during the day rests on two zones, not one number. Keep the cool side of the enclosure at 75 to 80°F.

Let the basking branch, or the space right under the light, run 82 to 86°F. Mourning geckos are small and thin bodied, so they warm up fast.

They do not need the high basking spikes larger lizards use. A single warm perch near the top of the enclosure is enough.

A study on a subtropical Taiwan population found something useful here. Egg laying only happens once mean ambient temperature climbs above 22.4°C, or about 72°F.

That same population saw July highs near 34°C, or 93°F, and warmer summers sped up egg development. Short spells in the low 90s°F are tolerated. A baseline in the mid 70s°F or warmer keeps the gecko active and breeding.

The Merck Veterinary Manual gives a general rule for reptile basking spots. Set the warm zone about 9°F above the ambient gradient rather than picking an arbitrary number.

For a mourning gecko kept near 80°F ambient, that points to a basking area in the high 80s°F. Many keepers run a bit cooler than that. This gecko hides more than it basks out in the open.

Nighttime Temperatures

Let the enclosure cool at night instead of heating it around the clock. Merck’s general husbandry guidance calls for a nighttime drop of about 9°F from the daytime ambient.

For a mourning gecko kept near 80°F by day, that means a nighttime range of roughly 70 to 73°F. That range fits the temperatures its native range sees after dark.

Most homes with normal indoor heat never drop below that range overnight. Many keepers add no extra heat at all once the room stays above 68°F.

If a room falls into the 60s°F, a low wattage heater on a dimming thermostat can hold that floor. That avoids extra light late at night. Extra light after dark would disrupt the gecko’s day and night cycle.

Choosing a Heat Source

Mourning geckos are arboreal. They spend most of their time on plants, cork bark, and glass rather than on the floor of the tank.

An overhead heat source works better here than a heat mat under the enclosure. It warms the branches and leaves the gecko actually uses.

A low wattage halogen bulb or a ceramic heat emitter above a screen top does the job well. Mount it over one end of the tank so the other end stays cooler.

A ceramic heat emitter is often the safer overnight choice, since it adds warmth with no light. Keep any bulb or emitter outside the screen top. Merck advises that heaters be screened from the animal, and never placed where a gecko could touch them.

Merck describes burns as leading to fluid loss, dehydration, and secondary bacterial or fungal infection. On a gecko weighing a few grams, a contact burn from an unguarded bulb is a serious injury.

• Overhead halogen or basking bulb: makes a clear warm perch and doubles as daytime light.
• Ceramic heat emitter: adds heat with no light, good for nighttime drops or dim rooms.
• Under tank heat mat: rarely useful for an arboreal species, and only on part of the floor.

Thermostats and Overheating in Small Tanks

Small glass and PVC tanks heat up fast. This is true of the 10 to 20 gallon tanks and small bioactive cubes many keepers use for mourning geckos.

A bulb sized for a much larger tank can push the whole space past 90°F within an hour. That kind of spike is dangerous for an animal this small and this thin skinned.

A thermostat is not optional in a small mourning gecko setup. Wire a dimming or pulse proportional thermostat between the heat source and the outlet.

It holds the basking spot at a set point and cuts power before the tank overheats. That matters most in a sealed bioactive setup with little airflow.

A dimming thermostat built for reptile heat sources gives finer control than a basic on and off model. It lowers power gradually as the set point nears, instead of cycling the bulb fully on and off.

Mourning Gecko UVB and Lighting

Mourning geckos are mainly nocturnal, with activity peaking after dark and around dusk. They rest through the brightest part of the day.

Merck states that UVB is especially important for diurnal lizards, which points to a lower need in a nocturnal species. It also states that all reptiles, including nocturnal and crepuscular ones, benefit from broad spectrum light.

Skipping UVB entirely is workable, but it shifts the whole vitamin D3 load onto the diet. Merck names D3 deficiency and lack of UVB among the causes of metabolic bone disease. A UVB free colony needs the D3 dusting described in the diet guide.

Most keepers use a low output UVB tube, in the 2 to 6% range, along the top of the tank. Merck recommends keeping UVB bulbs within about 12 inches of the animal.

Glass and most plastic covers filter out UVB before it reaches the gecko. Fluorescent UVB tubes also need replacing every 9 to 12 months as output fades. This holds true even when the bulb still lights up.

A low output UVB bulb built for crepuscular geckos is a common choice here. It gives enough ultraviolet light for vitamin D3 without the glare a stronger daytime bulb would add.

In a tall, densely planted tank, a T5 UVB fixture along the mesh top helps. It spreads light more evenly than one compact bulb over a single spot.

Plant Lighting for a Bioactive Enclosure

Bioactive mourning gecko tanks often hold live plants such as pothos, philodendron, or bromeliads. Those plants need brighter, steadier light than the gecko itself needs.

A UVB tube picked mainly for the plants pairs well with a lower output bulb for the gecko. That combination avoids forcing too much UV onto an animal that does not need it.

LED grow lights aimed at terrarium plants are a common add on next to a UVB tube. Standard grow LEDs do not supply UVB on their own.

Running both fixtures on one timer keeps plant growth and gecko lighting on the same schedule. Two separate timers tend to drift apart over time.

Photoperiod for Mourning Geckos

A 12 hour light and 12 hour dark cycle matches the day length across most of this species’ range. It works well year round in captivity.

Some keepers shift to 13 hours of light in summer and 11 in winter to track the seasons. The swing matters less here than for species that hibernate or brumate.

A timer keeps that schedule steady without daily adjustment. Merck calls a 12 hour photoperiod suitable for general reptile maintenance.

A fixed timer also protects the period when this gecko is naturally most active, the hours after lights out. Losing that rhythm to inconsistent lighting can quietly suppress feeding and activity.

Heating a Group Enclosure or Juveniles

Mourning geckos are usually kept in small colonies, since the species is parthenogenetic and does not need males to reproduce. A colony tank still uses the same warm and cool zones described above, just spread across more branches and cork bark pieces.

Add a second, smaller warm perch on the opposite side of a long or wide enclosure. This gives more geckos access to heat at once and cuts down on crowding near a single hot spot.

Hatchlings and juveniles use the same temperature range as adults. This species does not show the steep age based temperature needs seen in some other reptiles.

Keep juvenile enclosures on the cooler side of the recommended range rather than the warmer end. A small tank with a young gecko heats up even faster than an adult setup.

Signs the Heating or Lighting Setup Is Wrong

A mourning gecko pressed against the glass, well away from any perch, is often too warm rather than too cold. Dark coloring, open mouth breathing, or lethargy near the heat source point the same way.

A gecko clustered near the warm side at all hours is usually too cold everywhere else. Check the cool side reading before adding more heat. The fix is often a bigger gradient, not a hotter bulb.

Poor sheds, especially stuck skin on the toes and tail tip, often trace back to a tank running too hot and too dry at once. Lowering the basking temperature and raising humidity with regular misting usually fixes it within a shed cycle or two.

Measuring Heat and Light Instead of Guessing

A stick on dial thermometer on the glass reads air near the wall. It usually underreports the true basking spot temperature, since the perch itself runs warmer.

Check the actual surface at the perch, and again at the coolest point in the tank. That is the only reliable way to confirm the gradient described above is really there.

An infrared temperature gun gives an instant surface reading at any point in the tank. That beats a probe left sitting in open air.

Pair it with a digital hygrometer to check humidity at the same time. A tank running too hot from an oversized bulb often runs too dry as well, which makes shedding harder.

These figures are common keeper standards built around the gecko’s native tropical climate. No authoritative source in this research gave exact captive numbers for Lepidodactylus lugubris heating and lighting.

Check them against a full enclosure setup. Adjust for the room the tank actually sits in.

Frequently Asked Questions

What is the ideal basking temperature for a mourning gecko?

A basking area of 82 to 86°F suits most mourning geckos. This species is small and heats up fast compared with larger basking lizards. A single warm perch near the heat source is enough.

Do mourning geckos need a UVB light?

Mourning geckos are mainly nocturnal and do not have the strict UVB needs of a fully diurnal lizard. A low output bulb in the 2 to 6% range still supports normal vitamin D3 synthesis. Most keepers run one anyway.

How cold can it get at night for a mourning gecko?

A drop to 70 to 73°F overnight is normal and mirrors the swing in its native tropical range. Rooms that stay above 68°F at night usually need no extra heat source.

Can a heat mat replace a heat lamp for this species?

A heat mat alone is a poor fit for mourning gecko heating. This species is arboreal and spends most of its time off the substrate, where a floor mat has little effect. An overhead bulb or ceramic heat emitter works better.

Why do small mourning gecko tanks overheat so easily?

Small glass or bioactive enclosures hold less air. A bulb sized for a larger tank can push the whole space well past a safe range within an hour. A thermostat matched to the tank size prevents that spike.

How many hours of light should a mourning gecko get each day?

A 12 hour light and 12 hour dark cycle on a timer matches the day length across most of this species’ range. Keeping the schedule fixed matters more than the exact hour count.