Best UVB Lights for Leopard Geckos (Including Albino Morphs)

For years, the leopard gecko UVB debate split the reptile hobby down the middle. One camp argued these crepuscular geckos evolved without significant UVB exposure and thrive on D3 supplements alone. The other pointed to emerging field research showing wild leopard geckos do encounter meaningful UVB levels at dawn and dusk — and that captive specimens given access to appropriate UVB often display improved activity, brighter coloration, and better long-term calcium metabolism.

The science has largely settled. According to Arcadia Reptile's research, leopard geckos are classified as Ferguson Zone 1 animals, meaning they naturally experience low ambient UVB levels. They don't need the intense desert sun exposure of a bearded dragon — but the right low-level bulb, mounted correctly, supports D3 synthesis and overall health in ways that oral supplementation alone cannot fully replicate.

This guide focuses on what that means for choosing a bulb — and pays special attention to albino and light-sensitive morphs, which have unique requirements that can lead to genuine harm if ignored.

Quick Comparison Table

Detailed Reviews

Arcadia ShadeDweller ProT5 Kit 7%

The Arcadia ShadeDweller ProT5 Kit 7% is the cleanest answer to the question "what UVB should I get for my leopard gecko?" Arcadia designed this kit from scratch for crepuscular species — the 7% output at 10–12 inches lands precisely in the UVI 1.0–2.0 window that Ferguson Zone 1 research supports for normal leopard gecko morphs.

Everything is included: the fixture, the 7% T5 HO bulb, a curved reflector that concentrates UV delivery without creating harsh hot spots, and a link cable for daisy-chaining multiple units in larger setups.

For albino or reduced-pigment morphs, this kit works too — you simply raise the fixture to 18 inches to reduce UVI to the safer 0.5–0.7 range. That flexibility means one kit covers your whole collection regardless of morph.

The one genuine limitation is the 12-inch fixture size. It works perfectly in standard 36×18 enclosures when mounted along the warm side, but for wider PVC builds or 4×2 enclosures you'll need the Arcadia D3+ 6% T5 HO Bulb in a longer length instead.

Arcadia D3+ 6% T5 HO Bulb

The Arcadia D3+ 6% T5 HO Bulb solves the ShadeDweller's size limitation. Available in 22", 34", and 46" lengths, it spans the full width of nearly any enclosure on the market — ensuring your gecko encounters consistent UVB levels wherever it roams rather than only in a narrow zone beneath a short bulb.

You will need a compatible T5 HO fixture. If you don't already own one, the total cost approaches the ShadeDweller kit — but if you're upgrading an existing setup, this bulb is significantly more cost-effective.

Output at 6% is nearly identical to the ShadeDweller's 7% in practice. For albino morphs, raise the fixture a few inches beyond the standard recommended height. Arcadia's 12-month rated lifespan means lower annual replacement cost than the Zoo Med alternatives.

Zoo Med ReptiSun 5.0 T5 HO

The Zoo Med ReptiSun 5.0 T5 HO is the most available quality T5 bulb in North America. You can find it at Petco, PetSmart, and most independent reptile shops — a meaningful advantage when you need a replacement without waiting for shipping.

At 5% UVB, it's well within the safe range for normal leopard gecko morphs. The primary compromise is the 6-month rated lifespan, which means two replacements per year versus Arcadia's one. Factor in the replacement bulb cost and the actual annual expense is higher than it first appears.

This bulb pairs naturally with the Zoo Med T5 HO Terrarium Hood listed below. For keepers who prefer buying locally and staying in one ecosystem, this combination is a reliable, field-tested setup.

Arcadia ShadeDweller 2.4% Arboreal

Albino leopard geckos, blizzards, Murphy's patternless, and super snow morphs carry reduced melanin that makes them genuinely sensitive to UV radiation. Standard 5–7% bulbs at normal mounting heights can cause eye strain and, in prolonged exposure, UV burns — even when used correctly for normal morphs.

The Arcadia ShadeDweller 2.4% Arboreal was designed for exactly this problem. At 12 inches, it produces a UVI low enough to be safe for the most photosensitive morphs while still delivering enough UV to support natural D3 synthesis. You don't need to guess about distance adjustments or calculate whether your ceiling mount is high enough — the bulb handles it at standard height.

The limitation is specificity. This bulb produces too little UV for normal morphs that benefit from higher UVI exposure. If your collection is mixed, the standard ShadeDweller 7% raised to 18 inches for albinos is more versatile. But if you keep only sensitive morphs, this is the purpose-built solution.

Zoo Med ReptiSun 5.0 Mini Compact

The Zoo Med ReptiSun 5.0 Mini Compact is the easiest way to add UVB to a leopard gecko enclosure without buying new hardware. It screws into any dome lamp you already own.

The technical limitation is real: compact fluorescent UVB bulbs emit UV in a narrow cone directly beneath the bulb, with intensity dropping sharply outside that beam. A gecko at the edge of its enclosure — or under a hide, which is where leopard geckos spend most of daylight hours — receives essentially no UV benefit. For a species that rarely basks openly, this significantly reduces the practical value of this type of bulb.

We consider it a reasonable short-term or transitional option. If you're deciding whether your gecko responds positively to UVB before investing in a full T5 setup, a compact CFL gives you a low-cost proof of concept. For long-term use, a linear T5 HO is worth the upgrade.

Zoo Med T5 HO Terrarium Hood

The Zoo Med T5 HO Terrarium Hood is the standard fixture pairing for Zoo Med's T5 HO bulbs. The built-in reflector noticeably improves UV delivery compared to using a bare bulb without a reflector, and the hood comes in multiple sizes to match common enclosure dimensions.

The reflector is less efficient than Arcadia's curved ProT5 design — independent measurements typically show 15–20% lower UV intensity at the basking spot for the same bulb. For leopard geckos this gap is manageable: simply lower the fixture by an inch or two to compensate.

If you're already invested in Zoo Med hardware or need to buy from a local store, this hood plus the ReptiSun 5.0 T5 HO bulb is a practical, accessible combination.

UVB Buying Guide: Ferguson Zone 1, Albinos, and T5 vs Compact

Leopard geckos are classified as Ferguson Zone 1 animals by the widely used Ferguson Zone framework, which groups reptiles by their natural UV exposure in the wild. Zone 1 animals receive low ambient UVB — typically UVI 0–0.7 in shaded areas, with brief exposure up to 1.0–2.0 at dawn and dusk.

For your enclosure, that translates to a target UVI of 1.0–2.0 at basking height for normal morphs, measured with a Solarmeter 6.5 UV Index meter. You don't need the high-output bulbs designed for desert tortoises or bearded dragons — those will over-expose your gecko if mounted at normal heights.

The key variable is distance from the bulb to the gecko's back. A T5 HO 7% bulb at 10 inches delivers a very different UVI than the same bulb at 18 inches. Always check the manufacturer's UVI distance charts for your specific bulb and fixture combination, and verify with a UV meter if possible.

Recommended mounting distances:

For a deeper look at how lighting fits into the full enclosure setup, see our Leopard Gecko Heating Guide and Halogen Light for Leopard Geckos articles.

Albino and Light-Sensitive Morphs: A Special Case

Albino leopard gecko morphs — including Bell albinos, Rainwater albinos, Tremper albinos, and crosses like blizzards and super snows — have reduced or absent melanin. Melanin is the pigment that absorbs and disperses UV radiation in normal animals. Without it, UV light penetrates more deeply into sensitive tissue, including the eyes.

This doesn't mean albinos can't benefit from UVB. It means the dose must be lower. The target UVI for albinos at basking height is 0.5–0.7 — achievable with a 2.4% bulb at standard distance, or a 5–7% bulb raised significantly higher than standard recommendations.

Signs of UV overexposure in albinos include squinting, reluctance to emerge during the light period, and eye discharge. If you observe any of these, raise your fixture immediately and verify UVI with a meter.

For the safest approach with albino morphs, we recommend pairing your UVB setup with appropriate D3 supplementation as a backup. See our Best Leopard Gecko Supplements guide for D3 scheduling with and without UVB.

For a complete review of calcium supplementation specifically for albino morphs, see Best Calcium for Albino Geckos.

T5 HO vs Compact Fluorescent: Why It Matters

The single most impactful decision in your UVB setup is choosing between a linear T5 HO tube and a compact fluorescent (CFL) bulb.

A linear T5 HO tube emits UV evenly along its entire length, covering the full width of your enclosure. A gecko anywhere in the tank receives meaningful UV exposure — near its hide, at the cool end, or at the warm end.

A compact CFL emits UV in a narrow cone directly beneath the bulb. UV intensity drops sharply outside the center beam — sometimes to near-zero just 6–8 inches to either side. For an animal that spends most of daylight hours inside a hide rather than basking in the open, this dramatically reduces actual UV exposure.

For leopard geckos specifically, the difference matters more than for open baskers like bearded dragons. Leos rarely sit still under a light for extended periods. Linear T5 HO coverage ensures they accumulate UV naturally as they move through normal activity, rather than requiring them to bask in a specific spot.

ReptiFiles' leopard gecko care research aligns with this conclusion, consistently recommending linear T5 HO over compact CFL for effective, species-appropriate UVB coverage.

Final Verdict

For most leopard gecko keepers with normal morphs, the Arcadia ShadeDweller ProT5 Kit 7% is the right answer. It's the only bulb specifically engineered for crepuscular geckos, the complete kit eliminates compatibility guesswork, and the 12-month bulb life keeps ongoing costs manageable. If your enclosure is larger than 24" wide, pair the Arcadia D3+ 6% T5 HO Bulb with a compatible T5 fixture for full-width coverage.

For albino or light-sensitive morphs, the Arcadia ShadeDweller 2.4% Arboreal is the purpose-built solution that removes all guesswork. It delivers appropriate UVB at standard mounting height without requiring distance calculations or UV meter verification.

Budget-conscious keepers who need to buy locally will find the Zoo Med ReptiSun 5.0 T5 HO paired with the Zoo Med T5 HO Terrarium Hood a reliable and accessible alternative. The 6-month bulb life is a real cost, but the setup works well for normal morphs.

Whatever bulb you choose, UVB complements — not replaces — your existing D3 supplementation routine. See our Best Leopard Gecko Supplements guide for how to adjust your dusting schedule once UVB is in place. And if you're still building out your full setup, our Best Leopard Gecko Enclosures guide covers the right tank dimensions and ventilation to make your lighting work correctly.