Basking Bulb for Leopard Geckos: Halogen vs Incandescent

As an Amazon Associate, Lizardist earns from qualifying purchases. Some product links on this page are affiliate links.

A basking bulb for leopard gecko enclosures is a glowing lamp that radiates heat onto one spot of the floor. Veterinary care sheets disagree on whether it is required. A bulb is one valid way to make a warm end, and the bulb type matters less than the thermostat and the guard.

This guide covers how a bulb heats, halogen against incandescent, floods against spots, wattage, dimming, placement, and burn safety. The full temperature guide and equipment overview live elsewhere, so this page stays on the bulb.

Do leopard geckos need a basking bulb?

No. Leopard geckos (Eublepharis macularius) are nocturnal animals of dry and semi dry deserts.

Animal Diversity Web says they shelter under rocks or in burrows by day. They do not sit in open sun, so a bright lamp is not a biological requirement.

The veterinary sources split. The Royal Veterinary College (RVC) sheet calls for a light emitting spot bulb giving a basking area of about 32°C (90°F). It runs 12 or more hours a day and goes off at night.

The University of Liverpool puts the main heat on a mat at 30 to 35°C (86 to 95°F) and says a bulb may be needed. The RSPCA lists a guarded 60 to 100 W ceramic or basking lamp with a basking zone of 28 to 30°C (82 to 86°F). The leopard gecko heating and lighting page compares every heat source.

How a basking bulb for leopard gecko heat works

A bulb warms the air and the floor beneath it by radiation. The gecko then takes that heat through its belly as it rests on the warm surface.

Animal Diversity Web notes that adults absorb heat through their bellies from sun warmed rocks. A bulb over a flat stone imitates that.

A mat heats from below and a bulb heats from above. Merck Veterinary Manual says reptile heaters should be thermostat controlled and screened from the animals.

It also says to place them at one end to create a gradient. The goal is a warm end and a cool end so the gecko can choose.

One limit applies to every bulb. Merck states that light bulbs cannot provide nocturnal heat. A bulb handles the day, and a separate dark heat source handles a cold night.

Halogen vs incandescent basking bulbs

A halogen lamp is a type of incandescent lamp. Both heat a thin filament until it glows. The halogen version adds halogen gas in a small capsule, which recycles evaporated tungsten back onto the filament so it can run hotter.

The University of Calgary Energy Education site puts a standard incandescent filament at about 2,800 K and a halogen filament at up to 3,400 K. It gives a typical life of up to 1,000 hours for an incandescent and over 2,500 hours for a halogen.

The RVC reptile heating guide lists halogen bulbs as a near infrared source. It lists ceramic emitters, heat projectors, and mats as far infrared.

No veterinary source compares the two types for leopard geckos. The lamp figures above come from lighting references, and the thermostat notes are common keeper practice, not a tested result.

The practical difference is small. The thermostat, the guard, and a surface reading protect the animal.

Halogen heat lamp for a leopard gecko

A halogen heat lamp throws a crisp, bright pool of heat. The RVC guide advises against colored, artificial looking heat lamps.

It says the color serves no purpose and may stress reptiles. Choose a clear or white halogen, not a red or blue one.

The bright light matters for a nocturnal animal. A halogen basking bulb for leopard gecko use should sit over one end only.

The other end stays shaded so the gecko can retreat to a hide. Energy Education rates halogen bulbs as extremely hot and a burn hazard when touched in operation, so use a fixture rated for the wattage and a guard.

For a first purchase, a halogen basking flood bulb in a low wattage is easy to tune. Match the wattage to the tank and the thermostat, not to the box claim.

Incandescent heat lamp for a leopard gecko

A standard incandescent lamp does the same job with a softer, yellower light. Merck lists incandescent bulbs among reptile heat sources. The RSPCA accepts a basking lamp as the main heater when it is guarded and on a thermostat.

Many keepers pick an incandescent because it is cheap and easy to find. Because its filament runs cooler, it gives less light per watt than a halogen and a more orange glow, though the heat output at a given wattage is similar. Verify the surface temperature with a thermometer instead of assuming it.

Replace any bulb that flickers or dims. A cracked bulb or a loose bulb in a hot socket is a fire risk.

Flood vs spot bulbs

A flood bulb spreads its beam wide and makes a larger, gentler warm patch. A spot bulb focuses the beam and makes a smaller, hotter patch. This is a reflector design, and it applies to halogen and incandescent alike.

The RVC heating guide notes that combined heat and UV lamps give a narrow basking area. It says to pair them with other heat and UV sources. A flood suits a long tank that needs a broad warm end.

A spot suits a small tank where the heat belongs in a defined circle. In both cases you measure the floor under the beam.

Wattage in brief

The only wattage a veterinary source gives for this animal is the RSPCA range of 60 to 100 W for a ceramic or basking lamp. Tank size, room temperature, bulb height, and thermostat setting all change the result.

Treat a watt number as a starting point and let the thermometer decide. A separate wattage guide covers sizing.

Start low and move up. A modest bulb on a dimming thermostat is easier to tune than a strong bulb that fights the control. Buy headroom, then let the thermostat hold it down.

Dimming thermostat for a basking bulb

Every veterinary source here wants a thermostat on every heat source. RVC adds a digital max and min thermometer. The RSPCA says to check temperatures because thermostats are not always accurate.

For bulbs, the useful type is a dimming thermostat. It lowers the power smoothly instead of clicking the bulb fully on and off.

As common keeper practice, an on/off unit makes a bulb flash and a pulse unit can make it flicker. A dimming thermostat with a probe holds a steady glow and a steadier temperature.

Put the probe on the surface under the bulb, where the gecko lies, not in the air. Vet Times says to place the probe on the substrate over the heat source.

Set your target, then confirm with a second thermometer. The thermostat roundup compares options.

Placement and how to measure

Mount the lamp over one end, above a flat stone or the floor. Keep the beam off the hides.

A hide under a hot bulb overheats the gecko in its only shelter. The cool end needs its own hide, as the leopard gecko housing guide explains.

The sources set different readings. That is why you measure and do not guess.

Check the reading daily with a digital probe or an infrared temperature gun. The RSPCA recommends both.

Measure the floor where the gecko lies, not the bulb. The leopard gecko care page gives the wider picture.

Burn and fire safety

Burns are the main risk. Merck links burns in reptiles to unscreened incandescent lights and to hot rocks.

The RSPCA says the lamp must be guarded. Leopard geckos climb rocks and branches with their clawed toes, per Animal Diversity Web.

Use a mesh guard over the lamp, or mount it outside the lid so the animal cannot touch the glass. Do not stack decor under the beam, because a tall branch shortens the distance to the bulb.

Use a ceramic socket in a heat lamp dome rated for the bulb wattage. Keep bedding, cloth, and paper away from it.

Do not use a heat rock. Merck says hot rocks frequently cause burns, and the University of Liverpool sheet says to avoid them.

Product picks are on the best heat lamp page.

The reptile heat lamp roundup covers the wider market.

Nighttime: no lights

Turn the basking bulb off at night. RVC runs the spot bulb 12 or more hours a day and off at night.

Merck gives 12 hours as a suitable general photoperiod. A leopard gecko is nocturnal, so light at night disturbs its rhythm.

If the room drops below the night minimum, add dark heat. RVC lists a heat mat, tubular heater, heat plate, or ceramic bulb on a thermostat.

The RVC heating guide notes that ceramic emitters give night heat without light. Use a timer so the schedule never depends on memory.

Frequently Asked Questions

Is a halogen basking bulb for leopard gecko care better than an incandescent one?

Neither is proven better, since no veterinary source tested them against each other for this species. A halogen is whiter, and a standard incandescent is softer and cheaper. Pick the one that gives the right surface reading on a dimming thermostat.

Can a basking bulb replace a heat mat?

It can in some setups, and the RSPCA lists a basking lamp as a main heater. RVC suggests a spot bulb by day plus a night heat source if the room is cold. The University of Liverpool prefers a mat as the main heat.

How far should the bulb hang above the floor?

No veterinary source gives a distance. The answer depends on the wattage and the dimmer setting, so raise or lower the lamp until the floor reads in the target range. Keep it out of reach so the gecko cannot touch the glass.

Do leopard geckos need a red or blue night bulb?

No. The RVC heating guide advises against colored lamps, saying the color serves no purpose and may stress reptiles. Use a ceramic heat emitter or a mat on a thermostat for night heat.

Why does my bulb flicker on a thermostat?

A pulse or on/off thermostat switches the power in bursts, and a bulb shows each burst. A dimming thermostat gives a steady glow. If a dimmer still flickers, check the controller’s wattage rating.

Should I leave the basking bulb on all day and night?

No. Keep it on a 12 hour timer and off at night. Merck notes light bulbs cannot provide nocturnal heat, so a bulb left on only disrupts sleep.