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For a bearded dragon’s main UVB source, care guidance generally favors a high-output linear fluorescent tube positioned over the basking area, with shade available elsewhere in the enclosure. A T5 HO tube is a common linear option, but it does not guarantee the right exposure by itself: the lamp model, mounting distance, reflector, mesh and basking height all matter. A coil or compact lamp’s printed UVB percentage is not a measure of the UV Index (UVI) reaching your dragon.
At a glance
| Name | Best for | Key spec | Checked |
|---|---|---|---|
| Coil or compact UVB | A setup where the small lamp format is useful, subject to confirming suitability and exposure for the enclosure | A 13-watt, 12% compact lamp is LafeberVet’s example; its output is described as vastly lower than that of the 54-watt, 12% T5-HO tube in the same example | November 2026 |
| T5 HO linear UVB | A primary UVB source arranged to cover the basking area while leaving a shaded area | A 54-watt, 12% T5-HO tube appears in LafeberVet’s illustrative comparison; Zoo Med lists a ReptiSun 10.0 T5 Linear as an example UVB source for a juvenile setup | November 2026 |
The wattages and percentages above are examples from care sources, not universal specifications or a prescription for every enclosure. The percentage printed on a lamp does not tell you the UVI at your dragon’s basking height. Match the exact lamp and fixture to the enclosure and follow that model’s mounting instructions. The figures are useful for illustrating why package labels alone are not enough; they do not establish that one of these particular examples is right for every animal or enclosure.
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Why does a bearded dragon need UVB?
UVB helps a bearded dragon produce vitamin D3, which supports calcium use. A suitable lamp arrangement therefore needs to deliver UVB to the animal where it actually basks—not merely emit UVB somewhere above the enclosure. UVB from a lamp should not be expected to pass through window glass, so a sunny-looking spot behind a window is not a substitute for an appropriately set up enclosure light. The RSPCA bearded dragon care sheet advises against relying on light through window glass for UVB.
For the same reason, visible brightness is not a reliable way to judge whether a UVB lamp is still delivering the intended exposure. The RSPCA care sheet says UV output decreases and advises changing lamps according to the manufacturer’s directions. A lamp can still appear to light up even when its UVB output has declined; use the replacement instructions for the specific model rather than waiting for it to look dim. The care guidance does not give one replacement interval for every lamp, so do not transfer a schedule from a different model.
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What is the difference between a coil UVB bulb and a T5 linear tube?
A coil or compact lamp is a small-format bulb; a T5 HO is a high-output linear fluorescent tube. The practical difference for a bearded dragon is not just shape: the sources emphasize output, coverage, distance and the ability to create a basking-to-shade gradient.
LafeberVet illustrates the output issue with a 13-watt, 12% UVB compact lamp and a 54-watt, 12% UVB T5-HO tube. It says the compact example has vastly lower output than the tube, despite both carrying the same percentage rating. This is a comparison of those examples, not proof that every compact lamp performs alike or that any particular T5 will deliver the right exposure in your enclosure. The percentages describe the products’ labels; neither percentage should be read as the UVI at the animal.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →LafeberVet describes linear UVB fluorescent tubes as “the most versatile and widely-used UVB lamps sold for use with reptiles.” For a bearded dragon, a further practical advantage is the ability to place a tube over the warm end and leave a cooler, shaded area. The RSPCA recommends a high-output fluorescent tube toward the hot end, up to half the vivarium length, so the animal can move into shade at the cool end. Its advice concerns the arrangement, not a claim that every tube, length or installation is suitable.
A compact lamp’s small footprint may be useful where space is limited, but that convenience does not establish that it can serve as the main UVB source for a particular bearded dragon. The reviewed guidance supports linear tubes as the more generally recommended arrangement for the primary source; it does not provide a universal compact-lamp setup or a blanket rule that every compact lamp is unsuitable. If considering one, verify the exact model’s intended use and determine the exposure at the animal’s position rather than relying on the packaging percentage.
In practical terms, the format comparison is a starting point, not the final decision. A tube can span more of the basking area and help form a gradient, while a compact lamp occupies less space; neither format tells you by itself how much UVB reaches the dragon. The physical arrangement must still be checked against the actual enclosure. A fixture that is compatible with the tube, a suitable reflector, the barrier between lamp and animal, and the animal’s basking height all affect the outcome. A smaller lamp is not automatically easier to set up correctly, and a linear tube is not automatically safe or effective just because it is linear.
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Which UVB format should you choose for a bearded dragon?
For a primary enclosure light, start with a high-output linear tube and a compatible fixture, then confirm that its placement creates the intended exposure and shade. A T5 HO linear tube is a product category worth considering—not an automatic guarantee of correct UVB. A compact or coil lamp should not be chosen as a shortcut based only on its percentage rating or small size.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsFor example, Zoo Med lists its ReptiSun 10.0 T5 Linear among UVB sources for one juvenile bearded dragon setup. Treat that as an example, not a universal prescription: a lamp’s suitability depends on the exact model, tube length, mounting arrangement, mesh, reflector and basking height. The Zoo Med bearded dragon care page provides the product example, but it does not establish one best brand, tube length or mounting distance for all enclosures.
Before choosing, check the following for the actual enclosure:
- Coverage: Can the light cover the basking area while leaving a distinct shaded area the dragon can reach?
- Mounting and barriers: Will the fixture sit above or below the mesh, and what distance will separate the lamp from the basking position? Follow the specific lamp’s instructions for that arrangement.
- Fixture and reflector: Is the fixture compatible with the lamp, and is the reflector appropriate? LafeberVet notes that a good reflector can substantially increase output under a tube.
- Exposure at the animal: What UVI reaches the dragon at basking height, and does that fit the care target you are following?
- Maintenance: What replacement schedule does the lamp manufacturer specify, and how will you account for declining UVB output?
It also helps to compare complete product-and-fixture combinations rather than shopping by a percentage or tube format alone. Record the lamp’s exact model and length, the fixture it is designed to work with, and whether your installation includes mesh. Then compare the mounting instructions with the basking surface and the shade area you can provide. The RSPCA’s recommendation of a tube up to half the vivarium length is a useful arrangement example, not a universal calculation that overrides the product directions or enclosure dimensions.
There is no price comparison or required purchase list established by these care sources. A compatible fixture is part of the setup, and an appropriate UV Index meter may help check output, but the sources do not specify a budget or say that every keeper must buy a meter. Prioritize fit and installation instructions over a low price or a higher-sounding percentage.
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What UVI should the basking area have?
The sources give different basking-area recommendations, so there is no single target to present as a universal consensus. The RSPCA recommends UVI 3.0–5.0 in the basking zone and zero in shade; ReptiFiles gives UVI 4.0–4.5 for the basking area. These are source-specific husbandry targets, not results from a comparison of coil and T5 lamps. The ReptiFiles lighting guidance is the source for its 4.0–4.5 target.
UVI is more useful for judging exposure at the animal’s location than a bulb’s printed UVB percentage. The delivered exposure depends on the actual lamp output, its distance from the dragon, the reflector and any barrier such as mesh. A 12% label does not mean the dragon receives UVI 12, nor does it tell you whether the basking zone meets a care recommendation. Read the package as a product identifier, not as a measurement taken at the basking surface.
ReptiFiles lists different example mounting distances for installations with and without mesh. That illustrates why a distance from one setup cannot safely be transferred to another. Use the instructions for the exact model and installation, and account for the basking surface and any screen between lamp and animal. Do not select a distance from a generic chart or infer one from the T5 label alone. If the lamp instructions distinguish mesh from no-mesh mounting, use the row that actually matches your fixture arrangement.
If you need to check exposure, the RSPCA recommends checking UV output at the animal’s level with an appropriate meter. A UV Index meter is an optional way to assess the setup; the guidance does not make buying one mandatory. If you do not have a meter, take extra care to match the fixture, barrier, distance and replacement directions to the precise lamp model, and seek knowledgeable reptile-veterinary or husbandry advice when those instructions do not resolve a setup question.
When checking a reading, the relevant place is the animal’s basking position, not simply the lamp housing or an arbitrary point in the enclosure. The goal is to assess exposure where the dragon can bask and to preserve a shaded retreat. A reading should be interpreted alongside the chosen care source’s target and the complete installation; it cannot make a mismatched fixture, obstructed lamp or unsuitable arrangement correct on its own.
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How should you arrange a T5 UVB lamp?
Arrange the lamp to serve the basking end while preserving an area of shade, then verify the model-specific mounting details. The goal is a usable gradient, not uniform exposure across every part of the enclosure. A gradient matters because the cited recommendations explicitly pair UVB in the basking zone with access to shade, allowing the dragon to move between areas rather than being under the same exposure throughout.
- Choose a compatible high-output linear lamp and fixture. Confirm the exact lamp model and tube length, and use the fixture and reflector specified or approved for it. A reflector can substantially affect output, so a tube installed in a different fixture may not deliver the same result.
- Plan where the basking and shaded areas will be. Position the tube toward the warm end. The RSPCA suggests a fluorescent tube up to half the vivarium length, with shade remaining at the cool end. Do not interpret “up to half” as a required length for every enclosure.
- Check the lamp’s instructions for the exact installation. Establish whether it is mounted above or below mesh and the prescribed distance from the basking area. Mesh, reflector, lamp model and height affect the result, so there is no distance that can be supplied safely for every T5.
- Consider the UVI target you are following. The RSPCA’s recommendation is 3.0–5.0 at the basking zone with zero in shade; ReptiFiles’ recommendation is 4.0–4.5 in the basking area. Keep the selected source’s target attributed rather than blending the figures into a falsely precise universal standard.
- Check exposure at the animal’s level when practical. The RSPCA recommends an appropriate meter for checking UV output at the animal’s level. If readings are unexpectedly low or high, revisit the barrier, distance, reflector and the instructions before changing the arrangement.
- Keep track of lamp replacement. Follow the manufacturer’s interval. UVB output declines over time even if the lamp still produces visible light, so appearance alone is not a dependable maintenance check.
As you complete the setup, make sure the shade is actually accessible: a shaded corner that the dragon cannot move into is not the same as a usable retreat. Likewise, do not assume that extending a tube across more of the enclosure is always an improvement. The cited RSPCA layout places the high-output tube toward the hot end and leaves the cool end shaded. Use that principle to plan the enclosure, then follow the selected lamp’s own installation instructions for the actual distance and barrier.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can go wrong when choosing or installing UVB?
The most common mistake is treating a lamp label or a generic distance as a complete setup specification. Correct the decision by checking the complete arrangement—lamp, fixture, reflector, mesh, distance, basking position and shade—against the exact model’s instructions.
- Choosing by percentage alone: The same percentage can appear on lamps with very different outputs, as LafeberVet’s compact-versus-T5 example shows. Compare the actual model and determine exposure at the animal rather than assuming matching percentages mean matching UVI.
- Assuming all T5 installations are equivalent: A tube’s output at the basking spot changes with distance, reflector and obstruction. Follow the instructions for that lamp and installation instead of copying a distance from another enclosure.
- Lighting the whole enclosure without leaving shade: The cited care guidance calls for a gradient, with the dragon able to move out of the basking zone. Place the tube toward the warm end and preserve an accessible shaded area.
- Forgetting the mesh: A screen between the lamp and the animal changes the installation. Check the product’s directions for the mesh arrangement and assess exposure at the dragon’s level.
- Keeping an old lamp because it still looks bright: Visible light does not confirm adequate UVB. Follow the manufacturer’s replacement directions because output declines.
- Using a window as the UVB source: The cited guidance says UVB from a lamp should not be blocked by window glass. A bright window view does not establish that suitable UVB reaches the animal.
Another avoidable pitfall is treating an example product as a guarantee. Zoo Med’s ReptiSun 10.0 T5 Linear is named as an option in one juvenile setup, but the example does not tell you which tube length, distance or fixture fits every enclosure. Check the specific product directions and layout rather than buying a product solely because its name or percentage resembles the example.
Finally, do not solve uncertainty by combining the two UVI recommendations into a new number or by guessing at distance. The sources give distinct targets and emphasize setup variables. Keep the target tied to the care guidance you are using, and keep the physical installation tied to the exact lamp’s directions. If those directions are unclear for your enclosure, get qualified husbandry or veterinary guidance instead of treating a generic online distance as interchangeable.
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What does the cited guidance not establish?
The sources support a format-level recommendation and explain the factors that affect delivered UVB; they do not identify one universally correct lamp, distance, tube length or replacement interval for every bearded dragon enclosure. Exact mounting and replacement instructions are model-specific, and the RSPCA and ReptiFiles provide different basking UVI targets. Those differences should be kept visible rather than resolved by inventing a single number.
Likewise, the wattage-and-percentage example is not a head-to-head measurement of every coil and T5 lamp. It demonstrates why identical percentage labels are not enough to compare products. For a real setup, the useful decision is whether the exact lamp and installation provide the needed basking exposure and a shaded retreat—not whether a package sounds powerful. No individual lamp has been tested here, and the care sources do not provide product prices, affiliate terms or a universal cost estimate.
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Frequently Asked Questions
Is a coil UVB bulb enough for a bearded dragon?
The cited care guidance generally favors a high-output linear fluorescent tube as the main source, arranged to provide UVB at the basking area and shade elsewhere. It does not establish a universal coil-lamp setup or say every compact lamp is unsuitable. If considering a coil, check the exact model’s intended use and determine the exposure at the animal’s level rather than relying on its percentage label.
How far should a T5 UVB lamp be from the basking spot?
There is no universal distance in the cited guidance. ReptiFiles lists different example distances for installations with and without mesh, and the result also depends on the exact lamp, reflector and basking height. Follow the model-specific instructions for your installation; check UVI at the animal’s level when practical.
Can UVB from a lamp pass through glass?
No. The RSPCA guidance says UVB from a lamp should not be blocked by window glass, so placing an enclosure beside a bright window does not make the glass a UVB-permeable barrier.
Does a UVB bulb need to look bright to be working?
Visible brightness and UVB output are different things. A lamp may still produce visible light as its UVB output declines, which is why the manufacturer’s replacement directions matter.
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Are the RSPCA and ReptiFiles UVI targets contradictory?
They are different recommendations from different care sources: the RSPCA gives 3.0–5.0 in the basking zone, while ReptiFiles gives 4.0–4.5 for the basking area. The figures should be attributed to their sources, not described as measurements or a single agreed value.
The Bottom Line
For a bearded dragon’s primary UVB source, a high-output T5 HO linear tube is the more generally recommended format in the cited care guidance because it can cover the basking area while leaving shade available. It is not a one-size-fits-all prescription: match the lamp and compatible fixture to the enclosure, account for mesh, reflector and basking height, follow the model’s mounting and replacement directions, and assess UVI at the animal’s level when practical. A coil’s percentage label alone cannot confirm the exposure your dragon receives.
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