Halogen Lights for Leopard Geckos (2026)

TL;DR: Halogen bulbs are the best overhead heat source for leopard geckos, producing radiant heat that closely mimics sunlight and enabling natural basking behavior that under-tank heaters alone cannot provide. A 35–50W halogen flood bulb paired with a dimmer thermostat can maintain a basking surface temperature of 88–92°F (31–33°C) without overheating. Unlike ceramic heat emitters, halogens also emit visible light, supporting a natural day-night cycle.

You set up a heat mat, did everything the pet store suggested, and your leopard gecko still refuses to bask. Or maybe you bought a ceramic heat emitter and now the hot side is a mystery — too hot some days, just right on others. The problem isn't commitment. It's the heat source.

Halogen bulbs are now the go-to recommendation from science-based keepers and reptile vets. They produce infrared heat that penetrates the surface layers of a leopard gecko's skin — mimicking the sun in a way that heat mats and ceramics simply cannot. This guide covers every practical detail: which bulb, which wattage, how to pair it with a thermostat, and exactly what to do at night.

For a full picture of your leo's habitat needs, see our leopard gecko species page.

Why Halogen Works

The short answer: halogen bulbs produce infrared-A (IRA) and infrared-B (IRB) radiation — the same deep-penetrating wavelengths found in natural sunlight. Unlike ceramic heat emitters or heat mats, halogen heat is absorbed through the skin and muscle tissue, warming the gecko from the outside in exactly the way the sun would.

Leopard geckos are ectotherms — they rely on absorbing external heat to regulate body temperature, digestion, and immune function. A heat mat only warms the belly contact surface. A halogen basking spot warms the whole animal.

IRA vs. IRB: The Science in 30 Seconds

Infrared light exists on a spectrum. IRA (700–1400nm) penetrates deepest — reaching muscle tissue and organs. IRB (1400–3000nm) warms the skin surface. Halogen bulbs produce both, which is why reptile vets increasingly describe them as the closest available approximation to sunlight.

Ceramic heat emitters produce primarily far-infrared (FIR/IRC), which heats air and surfaces but does not penetrate tissue. Heat mats produce FIR belly-contact heat only — useful as a supplement, but not a true basking replacement.

The Arcadia Halogen: Industry Gold Standard

The Arcadia Halogen Heat Lamp 50W is the most trusted halogen among science-based keepers. Arcadia publishes full spectral data, and the 50W version is purpose-sized for small to mid-range enclosures — delivering clean IRA/IRB output without the overheating risk of higher uncontrolled wattages.

Pro Tip: Halogen bulbs MUST be run on a dimmer thermostat. An uncontrolled halogen will overshoot your target temperature — sometimes fatally. Never plug one directly into a wall outlet.

Choosing the Right Wattage

Match wattage to enclosure size — not to the gecko's age. The correct wattage is the one that reaches your target basking spot temperature of 88–95°F (target 90°F) when controlled by a thermostat at the low end of the dial. If you need the thermostat at 95% output to reach 90°F, your bulb is underpowered. If the thermostat is constantly at 20% output, your bulb is too strong.

Here is the general wattage guide:

• 50W — Small enclosures, tanks under 20 gallons, close-mount setups
• 75W — Standard 40-gallon breeder tanks (the most common leopard gecko enclosure)
• 100W — Large enclosures, tall tanks, cold rooms where ambient temperature drops significantly

Most Focused Beam: Exo Terra Sun Glo 75W

The Exo Terra Sun Glo Halogen Basking Spot Lamp 75W produces one of the tightest beam angles of any halogen in this category. That precision means the basking spot stays concentrated on your slate tile, rather than radiating heat across the full enclosure and raising ambient temperatures.

This is important in a leopard gecko setup because you need a genuine thermal gradient — not a uniformly warm box. A tight beam preserves the cool side (75–80°F) while nailing the basking zone (88–95°F).

Best Budget Pick: Zoo Med Reptile Basking Spot 75W

If you need a cost-effective entry point, the Zoo Med Reptile Basking Spot Lamp 75W is the most widely available option. Its beam is broader and softer than the Exo Terra, which means slightly more heat spread across the enclosure — fine for most setups, but worth noting if your cool side is consistently running too warm.

Pro Tip: Always measure basking spot temperature with a digital infrared temperature gun (not a stick-on thermometer strip). Aim the gun directly at the slate tile surface beneath the bulb for an accurate reading.

For the best enclosure to pair with your halogen setup, check out our best leopard gecko terrariums guide.

Thermostat Setup

Do not skip this section. A halogen bulb without a thermostat is a fire hazard and a danger to your gecko. Thermostats are not optional accessories — they are a non-negotiable safety component.

For halogen bulbs, you need a proportional (dimming) thermostat, not an on/off thermostat. On/off thermostats cause constant flickering — the bulb clicks on and off rapidly, which breaks the halogen filament within days. A proportional thermostat dims the bulb up and down smoothly to maintain temperature, which is also how the bulb lasts its full rated lifespan.

Temperature Targets (Set These on Your Thermostat)

Best Budget Thermostat: Inkbird ITC-308

The Inkbird ITC-308 Digital Temperature Controller is the most recommended budget thermostat in the leopard gecko keeper community. It is a digital on/off controller — technically not proportional, but it cycles slowly enough that most keepers use it successfully with halogens on lower wattages. Set the probe near (not directly under) the basking spot. At $25–35, it is significantly cheaper than premium options while still providing essential over-temperature protection.

Best Premium Thermostat: Herpstat 1

For full proportional dimming and long-term reliability, the Herpstat 1 Proportional Thermostat is the keeper community's top recommendation. Herpstat thermostats are built in the USA with reptile applications specifically in mind. The proportional dimming extends bulb life, maintains rock-steady temperatures without fluctuation, and protects against runaway heating. The Herpstat 1 handles one zone (your basking spot probe) and is the right choice for a single-enclosure setup.

Pro Tip: Place your thermostat probe 2–3 inches from the center of the basking spot, not directly under the bulb. This allows the thermostat to read representative air temperature without being artificially inflated by direct bulb heat, giving you more stable overall zone management.

For context on the broader reptile UVB lighting landscape, the Ferguson Zone system used by herpetologists classifies leopard geckos as Zone 2 — important if you plan to add supplemental UVB alongside your halogen.

Night Heating Done Right

Turn the halogen OFF at night. This is not optional — it is one of the most important aspects of proper leopard gecko husbandry. Leopard geckos are crepuscular; they are active at dawn and dusk and need genuine darkness during nighttime hours. A halogen left on 24 hours disrupts their circadian rhythm and stresses the animal.

Most homes stay warm enough (above 65°F) that no supplemental night heat is needed. Check your cool side temperature at 3 AM for a week. If it stays above 60°F, you do not need supplemental heat.

When You Do Need Night Heat

If your room drops below 60°F overnight — common in cold climates, drafty rooms, or winter months — you need a heat source that produces NO visible light. Your options are:

• Ceramic Heat Emitter (CHE) — infrared heat, zero light, connects to on/off thermostat
• Deep Heat Projector (DHP) — produces IRA/IRB like a halogen but with no visible light output

The Industry Best Practice: Halogen + DHP Combo

The best supplemental night heat option is the Arcadia Deep Heat Projector 50W. This pairing — halogen 75W by day, Arcadia DHP 50W by night — has become the industry best practice among science-based keepers. The DHP produces the same IRA/IRB penetrating heat as a halogen, maintains the quality of heat the gecko's physiology expects, and produces zero visible light.

Set the DHP on its own thermostat probe to maintain 65–70°F nighttime floor temperature. It runs at low power — just enough to prevent the enclosure from chilling, not to replicate daytime basking.

Pro Tip: NEVER use red, blue, or purple "night" light bulbs. Leopard geckos can see these wavelengths clearly. Research shows that colored nocturnal lights disrupt leopard gecko sleep cycles, elevate stress hormones, and suppress feeding behavior. The "geckos can't see red" myth is outdated and well-refuted.

Seasonal Photoperiod

Photoperiod means the number of hours your halogen is on each day. Like temperature, it should vary seasonally to mimic the natural light cycles of leopard geckos' native range in Pakistan, Afghanistan, and northwestern India.

The photoperiod schedule to use:

How to Transition Seasonally

Do not flip from 14 hours to 10 hours overnight. Abrupt photoperiod changes are stressful. Instead, adjust by 15–30 minutes per week over 4–8 weeks to match the gradual seasonal shift that would occur in the wild. A programmable digital outlet timer makes this easy — most allow you to set on/off times down to the minute.

Winter photoperiod reduction is particularly important for breeding adults — shorter days combined with a slight cool-side temperature drop trigger natural reproductive readiness. For non-breeders, a consistent 12-hour cycle year-round is acceptable.

Pro Tip: Use a mechanical or digital outlet timer for your halogen, completely separate from your thermostat. The thermostat controls intensity (temperature). The timer controls on/off schedule (photoperiod). Keep these two functions on two separate devices.

Common Mistakes

Mistake 1: Running a Halogen Without a Thermostat

An uncontrolled halogen will overheat the basking spot within minutes. Basking surface temperatures above 104°F cause tissue burns — often without the keeper noticing. Always wire your halogen through a thermostat before first use.

Mistake 2: Using Colored Night Bulbs

Red, blue, and purple "nocturnal" bulbs remain on pet store shelves despite scientific consensus against them. Leopard geckos have tetrachromatic vision and can detect these wavelengths clearly. A red bulb is a constant stressor that suppresses feeding and disrupts sleep. Use a DHP or CHE instead — both produce zero visible light.

Mistake 3: Moving the Bulb While Hot

Halogen filaments are extremely fragile when heated. Moving the bulb while on — or within 5 minutes of switching off — breaks the filament instantly. Always allow a full cool-down before repositioning.

Mistake 4: No Basking Substrate

A halogen aimed at bare floor creates a small, uneven hot spot. Place a flat slate tile directly beneath the bulb. Slate distributes heat evenly across its surface, giving your gecko a full body-length basking zone rather than a 2-inch point of contact.

Mistake 5: No UVB at All

Halogen bulbs produce zero UVB. Current evidence suggests low-level UVB (UVI 0.5–1.5, Ferguson Zone 2) provides measurable health benefits for leopard geckos — better D3 synthesis and reduced oversupplementation risk. A dedicated T5 HO low-output UVB tube is an easy addition alongside your halogen. See our reptile UVB guide overview for technical context on how UVB systems work.