The Best UVB Light for a Tegu
Researched by Johnny Alto · last updated July 28, 2026
Short answer: The best UVB light for a tegu is the Arcadia D3+ Desert 12% UVB T5 HO Lamp (22 inch). The Arcadia 12% Desert is the strongest widely-trusted T5 HO tube and the community default for large, sun-basking lizards like Argentine and Colombian tegus that need a solid UV gradient across a big body. The main things to weigh are use t5 ho, not t5 standard or coil bulbs, target uvi 3 to 4 at the basking spot, mount over the mesh, never behind glass, and replace every 12 months.
Arcadia D3+ Desert 12% UVB T5 HO Lamp (22 inch)
The Arcadia 12% Desert is the strongest widely-trusted T5 HO tube and the community default for large, sun-basking lizards like Argentine and Colombian tegus that need a solid UV gradient across a big body. Paired with a proper T5 HO reflector fixture it throws a usable UV column deep into a tall enclosure, and the 12-month lifespan is honest for T5 HO. The real limits: the bulb alone is useless without a matching T5 HO controller and reflector (sold separately), and 12 percent is powerful, so mounting distance matters, over-close mounting can cause photo-kerato-conjunctivitis (light burn). Aim for a UV Index of about 3 to 4 at the basking surface, roughly 12 to 18 inches from the tube behind mesh, and verify with a Solarmeter if you can.
Check price on Amazon Live price on Amazon. Representative image.Tegus are large, intelligent, sun-driven lizards that will not thrive under a coil bulb or a weak tube. This is for keepers building or upgrading a 4 to 6-foot enclosure who need genuine, gradient-forming UVB that reaches a basking platform, not a token light. Here is the strongest trusted tube, a gentler alternative, and the mounting rules that keep the animal safe.
How do the best options for UVB light for a tegu compare?
| Pick | Product | Why it makes the list |
|---|---|---|
| Top pick | Arcadia D3+ Desert 12% UVB T5 HO Lamp (22 inch) | The Arcadia 12% Desert is the strongest widely-trusted T5 HO tube and the community default for large, sun-basking lizards like Argentine and Colombian tegus that need a solid UV gradient across a big body. |
| Best value name-brand | Zoo Med ReptiSun T5 HO 10.0 UVB (24W, 2-pack) | Proven and easy to source, with a slightly gentler 10.0 output that leaves more room for error on distance. Sold only as a 2-pack here, and lower output than the Arcadia 12%, so mount it a touch closer. |
| Best fixture-included kit | an Arcadia Pro T5 UVB Kit (Desert 12%, reflector + controller + lamp) | Removes the bought-a-bulb-but-no-fixture mistake by including everything. It is pricier and sold mainly through specialty reptile retailers, so Amazon availability is inconsistent. |
| Best for big enclosures | the Arcadia D3+ Desert 12% T5 HO, 34-inch / 39W | Covers a 6-foot-plus tegu enclosure with one tube. It needs a matching 39W fixture and more headroom. |
What should you look for in UVB light for a tegu?
A few things separate a good UVB light for a tegu from a frustrating one: use t5 ho, not t5 standard or coil bulbs, target uvi 3 to 4 at the basking spot, mount over the mesh, never behind glass, and replace every 12 months. Weigh these before you buy.
- Use T5 HO, not T5 standard or coil bulbs: coils are too weak for a tegu and have a burn history.
- Target UVI 3 to 4 at the basking spot: a 12 percent tube mounted about 12 to 18 inches over mesh, a 10.0 slightly closer; confirm with a Solarmeter rather than guessing.
- Mount over the mesh, never behind glass: screen mesh blocks 30 to 40 percent of UVB, and glass blocks nearly all of it.
- Replace every 12 months: UV output decays before the visible light does, even while the tube still lights.
Why coil bulbs do not cut it
A tegu is a big, active lizard that basks like a small crocodile, and it needs UVB reaching across its whole body at basking height to metabolize calcium. A compact or coil UVB bulb simply cannot produce enough UVB at distance to do that in a large enclosure, and coils have a documented history of eye problems. A high-output linear T5 tube can, projecting a real UV column you can measure. Mount the fixture above the screen (mesh eats a third of the output), set the basking branch at the distance the tube's UV Index calls for, replace it yearly, and pair it with a separate basking heat source, since UVB is light, not heat.
What are the best alternatives?
Zoo Med ReptiSun T5 HO 10.0 UVB (24W, 2-pack)
Proven and easy to source, with a slightly gentler 10.0 output that leaves more room for error on distance. Sold only as a 2-pack here, and lower output than the Arcadia 12%, so mount it a touch closer.
Check price on Amazonan Arcadia Pro T5 UVB Kit (Desert 12%, reflector + controller + lamp)
Removes the bought-a-bulb-but-no-fixture mistake by including everything. It is pricier and sold mainly through specialty reptile retailers, so Amazon availability is inconsistent.
the Arcadia D3+ Desert 12% T5 HO, 34-inch / 39W
Covers a 6-foot-plus tegu enclosure with one tube. It needs a matching 39W fixture and more headroom.
Bottom line: the Arcadia 12% Desert T5 HO is the strong, gradient-forming tube a tegu needs (buy a fixture too); the ReptiSun 10.0 is the gentler, easy-to-source alternative. Mind the mounting distance to avoid light burn. Pair it with our basking bulb and UVB guides.
Frequently asked questions
What is the best UVB light for a tegu?
Arcadia D3+ Desert 12% UVB T5 HO Lamp (22 inch). The Arcadia 12% Desert is the strongest widely-trusted T5 HO tube and the community default for large, sun-basking lizards like Argentine and Colombian tegus that need a solid UV gradient across a big body.
What should you look for in UVB light for a tegu?
Focus on use t5 ho, not t5 standard or coil bulbs, target uvi 3 to 4 at the basking spot, mount over the mesh, never behind glass, and replace every 12 months.
What is a good alternative to the Arcadia D3+ Desert 12% UVB T5 HO Lamp (22 inch)?
The Zoo Med ReptiSun T5 HO 10.0 UVB (24W, 2-pack). Proven and easy to source, with a slightly gentler 10.0 output that leaves more room for error on distance. Sold only as a 2-pack here, and lower output than the Arcadia 12%, so mount it a touch closer.
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This is a research-based buying guide, not a personal hands-on review; recommendations reflect community consensus and verified buyer reviews. Prices and availability are subject to change, so always confirm on Amazon. As an Amazon Associate I earn from qualifying purchases. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.
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