Buying guide

The Best UVB Bulb for a Chameleon

Researched by Johnny Alto · last updated July 28, 2026

Short answer: The best UVB bulb for a chameleon is the Zoo Med ReptiSun T5 HO 5.0 UVB Lamp. The long-standing default UVB tube in the chameleon community because its 5.0 output delivers a correct UV Index at the basking distances used in tall screen cages without pushing animals into over-exposure. The main things to weigh are choose t5 ho, not t8 or coil bulbs, 5.0 vs 10.0 is a distance question, replace linear tubes about every 12 months, and uvb is not heat.

Top pick

Zoo Med ReptiSun T5 HO 5.0 UVB Lamp

The long-standing default UVB tube in the chameleon community because its 5.0 output delivers a correct UV Index at the basking distances used in tall screen cages without pushing animals into over-exposure. T5 HO (high output) is the right choice over older T8 tubes, producing roughly twice the usable UVB per watt and holding output at greater distance, which matters in a cage over 24 inches tall, and keeper Solarmeter readings consistently rank the ReptiSun 5.0 among the two or three reliable tubes. The honest limits: this listing is the bulb only, so you must buy a separate T5 HO fixture and reflector, and it degrades and must be replaced on schedule even though it still glows.

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How this guide was made: I don't own every product I write about, and I won't pretend otherwise. Unlike the hands-on reviews elsewhere on this site, this is a research pick, synthesized from chameleon-keeping communities, Solarmeter keeper readings, and thousands of buyer reviews. It reflects the community's consensus, not my own testing. See how we research our picks →

Chameleons are almost entirely UVB-driven for calcium metabolism, and metabolic bone disease from bad lighting is one of the most common killers of pet veileds and panthers. This guide is for a keeper setting up or fixing a screen cage who wants a linear T5 HO tube that hits the right UV Index at basking height, not a cheap coil bulb. Here is the community-standard pick, a complete kit, and the husbandry rules that keep the bulb working.

How do the best options for UVB bulb for a chameleon compare?

Pick	Product	Why it makes the list
Top pick	Zoo Med ReptiSun T5 HO 5.0 UVB Lamp	The long-standing default UVB tube in the chameleon community because its 5.0 output delivers a correct UV Index at the basking distances used in tall screen cages without pushing animals into over-exposure.
Best complete kit	Arcadia T5 UVB Kit, 24W 6% Forest (bulb + fixture + reflector)	Arrives as a full ready-to-hang kit with a good reflector, favored for planted chameleon cages. The 6% lamp is slightly stronger than the 5.0, so basking distance must be dialed in, ideally with a UV meter.
Best for very tall cages	Arcadia ProT5 6%, 48-inch bulb and fixture	The 48-inch length and strong output cover very tall or wide adult cages. It is too long for standard 24 to 36-inch cages, so size to your enclosure first.
Higher output option	Zoo Med ReptiSun T5 HO 10.0 Fixture	The 10.0 pushes UVB through more distance for very tall or heavily planted screen cages where a 5.0 reads too weak at basking height. At close range a 10.0 can over-expose, so only use it with real vertical distance and ideally a meter check.

What should you look for in UVB bulb for a chameleon?

A few things separate a good UVB bulb for a chameleon from a frustrating one: choose t5 ho, not t8 or coil bulbs, 5.0 vs 10.0 is a distance question, replace linear tubes about every 12 months, and uvb is not heat. Weigh these before you buy.

Choose T5 HO, not T8 or coil bulbs: T5 HO gives about twice the output per watt and real penetration; compact and coil UVB bulbs are widely discouraged for chameleons.
5.0 vs 10.0 is a distance question: use a 5.0 for basking zones roughly 8 to 12 inches from the tube, mounted on top of the screen (mesh blocks 30 to 40 percent of UVB); a 10.0 only for taller gaps.
Replace linear tubes about every 12 months: UVB output falls off long before the bulb stops making visible light, so mark the install date.
UVB is not heat: pair it with a separate basking bulb and a real temperature gradient.

Why the bulb type matters so much

Metabolic bone disease is largely a lighting failure, and it is preventable. Chameleons need enough UVB at basking height to make vitamin D3 and use dietary calcium, and a coil or compact bulb simply cannot deliver that reliably in a tall screen cage. A linear T5 HO tube can, which is why it is the standard. Mount the fixture on top of the screen (mesh eats a third of the UVB), keep the basking branch at the distance the bulb's UV Index calls for, and replace the tube every year even though it still lights up, because the invisible UVB fades long before the visible light does.

What are the best alternatives?

Best complete kit

Arcadia T5 UVB Kit, 24W 6% Forest (bulb + fixture + reflector)

Arrives as a full ready-to-hang kit with a good reflector, favored for planted chameleon cages. The 6% lamp is slightly stronger than the 5.0, so basking distance must be dialed in, ideally with a UV meter.

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Best for very tall cages

Arcadia ProT5 6%, 48-inch bulb and fixture

The 48-inch length and strong output cover very tall or wide adult cages. It is too long for standard 24 to 36-inch cages, so size to your enclosure first.

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Higher output option

Zoo Med ReptiSun T5 HO 10.0 Fixture

The 10.0 pushes UVB through more distance for very tall or heavily planted screen cages where a 5.0 reads too weak at basking height. At close range a 10.0 can over-expose, so only use it with real vertical distance and ideally a meter check.

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Bottom line: the Zoo Med ReptiSun T5 HO 5.0 is the community-standard tube (buy a fixture too); the Arcadia kit is the all-in-one, and the 10.0 is for very tall cages. Replace it yearly and mount it above the screen. Pair it with our incubator and small-pet guides.

Our top pickZoo Med ReptiSun T5 HO 5.0 UVB Lamp

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Frequently asked questions

What is the best UVB bulb for a chameleon?

Zoo Med ReptiSun T5 HO 5.0 UVB Lamp. The long-standing default UVB tube in the chameleon community because its 5.0 output delivers a correct UV Index at the basking distances used in tall screen cages without pushing animals into over-exposure.

What should you look for in UVB bulb for a chameleon?

Focus on choose t5 ho, not t8 or coil bulbs, 5.0 vs 10.0 is a distance question, replace linear tubes about every 12 months, and uvb is not heat.

What is a good alternative to the Zoo Med ReptiSun T5 HO 5.0 UVB Lamp?

The Arcadia T5 UVB Kit, 24W 6% Forest (bulb + fixture + reflector). Arrives as a full ready-to-hang kit with a good reflector, favored for planted chameleon cages. The 6% lamp is slightly stronger than the 5.0, so basking distance must be dialed in, ideally with a UV meter.

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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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