Exo Terra Sun Glo Halogen Review: A Basking Bulb That Does One Job
An Exo Terra Sun Glo halogen basking spot review: broad spectrum daylight, infrared heat penetration, neodymium coating, and the wattage and thermostat rules that matter.
Bright, hot and cheap, and worth nothing at all without a thermostat under it.
The verdict: A halogen basking spot that gives you the bright, focused overhead heat a bearded dragon orients to, for the price of a takeaway. Buy it as the main daytime heat source, on a dimming thermostat, with the wattage chosen for your enclosure rather than picked off a shelf. Do not buy it expecting it to supply UVB, because it does not, and no basking bulb replaces a linear UVB tube.
Exo Terra Sun Glo Halogen Basking Spot Lamp
~$20
A neodymium-coated halogen basking spot lamp producing broad spectrum daylight, UVA and concentrated infrared heat.
Check price on AmazonSpecifications
| Type | Halogen basking spot lamp |
|---|---|
| Light | Broad spectrum daylight |
| Heat | Enhanced infrared levels for heat penetration |
| Coating | Neodymium, which Exo Terra states enriches reptile coloration |
| UVA | Emits UVA, which Exo Terra associates with natural behaviour |
| UVB | None. A separate UVB source is required |
Specifications above come from Exo Terra's published product information. Treat pricing as approximate, since Amazon pricing moves.
What it does well
- Halogen runs hotter and brighter per watt than a standard incandescent, which is what produces a tight, sun-like basking spot rather than a warm smear.
- Bright overhead light is what triggers basking behaviour. Heat without light does not produce the same response, which is why this and not a ceramic emitter is the daytime source.
- It is cheap enough to keep a spare in the drawer, and basking bulbs fail without warning.
- Standard screw fitting, so it works in any ceramic-rated dome with a reflector.
- Available in several wattages, which is how you match the bulb to the height and the enclosure rather than fighting the thermostat.
Where it falls short
- No UVB. This is the single most misunderstood point about basking bulbs, and a dragon under a bright basking lamp with no UVB tube will develop metabolic bone disease.
- Halogen bulbs have a shorter service life than ceramic emitters and they fail suddenly. Keep a spare.
- Unregulated, it is at the mercy of the room. A wattage that is right in winter will overshoot on a warm afternoon, which is why it belongs on a dimming thermostat.
- The neodymium colour-enrichment claim is a cosmetic effect on how the animal looks, not a husbandry benefit.
- It gets extremely hot, so it needs a ceramic-rated holder and a guard, and it must not be positioned where the animal can climb to it.
What owners report
Owner reports on halogen basking spots across brands come down to two things: they work, and bulb life is variable. Several owners describe bulbs lasting many months and others describe early failures, which is normal for halogen and is the reason a spare matters more than the brand.
The recurring husbandry error in the reviews is wattage chosen by guesswork. The right wattage depends on the distance from bulb to basking surface and how well the enclosure holds heat, and there is no universal answer. Our basking bulb wattage chart gives a starting point, and a temperature gun confirms the result. The target for an adult is a basking surface of 95 to 110F with a cool end at 75 to 85F.
If you are choosing between bulb types, our halogen versus incandescent comparison explains why halogen generally wins, and the mercury vapour versus separate UVB and heat comparison covers the all-in-one option and why most keepers still separate the two.
Who it suits
- Anyone building a bearded dragon enclosure who needs the main daytime heat and light source.
- Keepers replacing a failed basking bulb who want a cheap, proven part.
- Setups that already have a linear UVB fixture and a dimming thermostat in place.
Who should skip it
- Anyone hoping for a single bulb that provides heat and UVB, who should read the mercury vapour comparison before deciding.
- Night heating, where a light source is the wrong answer entirely.
- Enclosures with no thermostat, where the first purchase should be the thermostat.
Alternatives worth considering
REPTIZOO Dimming Thermostat, PID Temperature Controller with Memory Function
~$28
A halogen basking bulb without a dimming thermostat is an uncontrolled heat source. This is the correct control type for a lamp and costs less than most on/off units.
Check price on AmazonArcadia Deep Heat Emitter 50 W for Reptile Enclosures
~$31
The complement rather than the replacement. Infrared with no visible light, for overnight warmth in a cold room, on an on/off thermostat.
Check price on AmazonZoo Med 24 Watt T5 HO ReptiSun 10.0 UVB Lamp, 2 pack
~$54
A basking bulb supplies heat and light but no UVB. Without a linear UVB tube alongside it, a bearded dragon cannot synthesise vitamin D3 and metabolic bone disease follows.
Check price on AmazonKeep reading
- Halogen vs incandescent basking bulb
- Mercury vapour vs separate UVB and heat
- Ceramic heat emitter vs basking bulb
- Basking bulb wattage chart
- Bearded dragon temperature guide
- REPTIZOO dimming thermostat review
- Best basking bulbs for bearded dragons
This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.
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A T5 10.0 UVB Fixture, the One Thing You Cannot Skip
Metabolic bone disease is the most common preventable illness in captive bearded dragons, and it comes down to inadequate UVB. A linear T5 tube across the basking side does what a coil bulb cannot, and the tube needs replacing roughly annually even when it still lights up.
Frequently Asked Questions
Does a basking bulb provide UVB?
No. A halogen or incandescent basking lamp provides heat and visible light, and some emit UVA, but not the UVB a bearded dragon needs to synthesise vitamin D3. You need a separate linear UVB tube. Skipping it is the most common cause of metabolic bone disease in captive dragons.
What wattage basking bulb do I need?
It depends on the distance from the bulb to the basking surface and how well your enclosure holds heat, so there is no single answer. Start from a wattage chart, fit the bulb on a dimming thermostat, and then measure the basking surface with a temperature gun. Adjust wattage rather than relying on the thermostat to fix a badly matched bulb.
Halogen or a standard incandescent basking bulb?
Halogen for most setups. It produces more heat and brighter light per watt and holds its output better across its life, which gives a tighter, sun-like basking spot. The trade is a shorter and less predictable service life, so keep a spare.
Can I leave the basking lamp on at night?
No. Light at night disrupts the animal's day and night cycle, and that includes coloured night bulbs. Bearded dragons benefit from an overnight drop into roughly 65 to 75F. If your room falls below that, use a light-free heat source such as a ceramic or deep heat emitter on a thermostat.
What about heat rocks and heat mats?
Do not use heat rocks. Contact burns from them are well documented and a dragon will stay on a hot surface longer than is safe. Heat mats are acceptable as supplementary belly heat in some setups but they are not a substitute for overhead basking heat, which is what this species uses to thermoregulate.
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