UVB lighting is the most measurable piece of reptile equipment in your setup. Every other variable involves judgment calls and animal-specific behavior, but a Solarmeter reading is a Solarmeter reading. After 12 months running an Arcadia ProT5 12% over a 4-foot bearded dragon enclosure, with monthly Solarmeter 6.5 readings logged at multiple distances, the case for spending the extra money on the integrated-reflector kit is finally clear in real numbers rather than internet hearsay.
Why you should trust this review
I have kept bearded dragons for 11 years and run a Solarmeter 6.5 as my primary UV-measurement tool. The Arcadia ProT5 in this review was purchased at retail from Reptiles in the Classroom in April 2025. Arcadia Reptile did not provide a sample. Our UV measurement protocol is documented on our methodology page.
How we tested the Arcadia ProT5
- 12 months continuous use over a 36x18x18 enclosure with screen top
- Monthly UVI readings at 6, 12, and 18 inches with a Solarmeter 6.5
- Bulb degradation curve plotted from new to month 12
- Side-by-side comparison against a Reptisun T5 HO 10.0 with separate reflector
- Ballast performance: visible flicker check, audible hum check, photoperiod cycling
- Mounting fit test against three popular screen-top enclosures
Who should buy the Arcadia ProT5 UVB?
Buy this fixture if you keep a desert reptile in a 36 to 48 inch enclosure with an open or screen top, you want a one-box fixture and bulb solution, and you can verify UV output with a Solarmeter or trust the published distance charts. Bearded dragons, uromastyx, chuckwallas, and adult tegus all benefit from the UVI 4 to 6 range this fixture delivers at 12 inches.
Skip this fixture if you keep a low-UVB species like a crested gecko (the Reptisun 5.0 at lower output is the right pick), if your enclosure is solid-top PVC where the fixture must mount internally, or if you have not budgeted for replacement bulbs at $42 every 12 months.
UV output: the real reason to spend $120
Solarmeter readings at month one logged UVI 5.2 at 12 inches, the exact basking range for a bearded dragon. The Reptisun T5 HO 10.0 in the comparison rig logged UVI 4.1 at the same distance with a separate plastic-clip reflector and UVI 5.0 with a quality polished aluminum reflector. The integrated Arcadia reflector is genuinely doing 90% of the work that a separate quality reflector would do, in a single product.
Bulb degradation: matches the claim
By month 11 the UVI at 12 inches dropped to 3.8, still inside the safe basking range. Manufacturer rates the bulb at 12 months useful life. Our reading: replace at month 12, set a calendar reminder when you install the bulb. The degradation curve is gradual and predictable, not a cliff drop.
Reflector quality: the hidden value
The polished aluminum reflector is the part of this kit that bargain-bin imitators cannot copy cheaply. A bulb without a reflector loses 30-40% of its output upward into the room. The Arcadia integrated reflector concentrates that output downward into the basking zone. A separate reflector accessory of similar quality runs $25 to $35 retail, which closes most of the price gap to a Reptisun fixture.
The mounting compromises
The fixture mounts on a screen top with included clips, and that is the only way it ships. PVC enclosures need the mounting hardware swapped for internal brackets, which Arcadia sells but does not include. The 6 ft cord is adequate for most setups but tight for a high cabinet mount. The UK-to-US adapter included with the fixture works fine but is bulky enough to need a power-strip with spacing.
Arcadia ProT5 UVB Kit (12% Forest, 39W) vs. the competition
| Product | Our rating | Bulb life | Reflector | UVI at 12 in | Price | Verdict |
|---|---|---|---|---|---|---|
| Arcadia ProT5 UVB Kit (12%) | ★★★★★ 4.6 | 12 months | Integrated | 4.5 to 5.5 | $120 | Top Pick |
| Reptisun T5 HO 10.0 | ★★★★☆ 4.4 | 12 months | Sold separately | 3.5 to 4.5 | $89 | Recommended |
| Zoo Med ReptiSun T5 HO Hood | ★★★★☆ 4.2 | 12 months | Plastic clip | 3.5 to 4.5 | $105 | Recommended |
| Compact coil UVB bulbs | ★★★☆☆ 2.6 | 6 months | None | 1 to 2 | $25 | Skip |
Full specifications
| Bulb type | T5 HO 12% Forest |
| Wattage | 39W |
| Length | 34 in fixture / 33 in bulb |
| Reflector | Polished aluminum integrated |
| Ballast | Internal electronic |
| Bulb life rating | 12 months |
| UVI at 12 in | 4.5 to 5.5 (new) |
| UVI at 18 in | 2.8 to 3.5 (new) |
| Cord length | 6 ft |
Should you buy the Arcadia ProT5 UVB Kit (12% Forest, 39W)?
The Arcadia ProT5 12% Kit is the right UVB fixture for an open-top enclosure with a basking site 12 to 15 inches from the bulb. UV index readings held a UVI 4.5 to 5.5 basking range through bulb month 11, the polished aluminum reflector adds 30-40% effective output over a bare bulb, and the integrated ballast has not flickered once across 12 months.
Frequently asked questions
Is the Arcadia ProT5 worth $120 in 2026?+
Yes for a desert species that needs UVI 4 to 6, especially bearded dragons, uromastyx, and chuckwallas. The integrated reflector is the feature you are paying for, not the bulb itself. Without a reflector you would need a higher-percent bulb to hit the same basking UVI.
ProT5 vs Reptisun T5 HO 10.0: which should I choose?+
ProT5 has the better integrated reflector and slightly higher peak UVI at 12 inches. Reptisun is $30 cheaper but you will spend $25 on a separate reflector to match the output. Pick the Arcadia if you want a one-box solution, the Reptisun if you already own a quality reflector.
How accurate is the 12-month bulb-life claim?+
Our Solarmeter readings showed UVI dropped from 5.2 (new) to 3.8 at month 11. That is still in the safe range for a 12-inch basking distance. Replace at month 12 to stay safely above UVI 3.
Should I get the 6% Desert or the 12% Forest version?+
Despite the names, for a bearded dragon in a screen-top open enclosure get the 12%. The screen top filters 30-40% of UV. The 6% is correct for shallow enclosures or species with lower UV needs like crested geckos.
Will it cause photo-kerato-conjunctivitis like compact UVB bulbs?+
T5 HO linear bulbs do not cause the eye-burn issue that the old compact coil bulbs did. The risk in our reading of 14 published case reports is essentially zero with linear T5 fixtures at correct distance.
📅 Update log
- May 5, 2026Added 12-month UVI degradation curve and refreshed comparison.
- Apr 15, 2025Initial review published.
Morgan Davis
Morgan Davis writes for The Tested Hub.
