A livestock infrared heating bulb is a red-glass, reflector-style lamp that screws into a compatible heat lamp fixture and gives young animals a warm spot in a cold building. It is one of the simplest ways to keep chicks, piglets and other young stock comfortable. It is also one of the easier ways to start a barn fire if it is chosen or installed carelessly.
How an infrared heating bulb works in a barn
An infrared lamp passes current through a filament, which gives off radiant energy. That energy is absorbed by the animals, bedding and floor beneath it, so surfaces warm up directly instead of the whole room's air being heated first. We describe the same principle in our guide to infrared lamp types and how to choose one, where we also note that radiant heating is not automatically more efficient in every setting. Efficiency depends on distance, reflector design, insulation and how well the lamp suits the job.
Three practical consequences follow from the physics.
- Heat is a gradient, not a uniform temperature. The spot directly under the lamp is warmest and the temperature falls toward the edges. This is a feature, because animals can choose where to rest, but only if the pen is large enough to include a cooler area. National Hog Farmer notes that lamps heat a variable area and can inadvertently warm the sow if mounted too high or too close in narrow creep areas.
- An air thermometer can mislead you. Researchers point out that the 32–35 °C figure commonly quoted for piglets is a dry-bulb air temperature, and that it is often misread as the surface temperature wanted under a lamp. Measure at animal level, and measure both under the lamp and at the edge of the warm zone.
- Animal behavior is the most reliable sensor. Chicks that huddle tightly under the lamp are too cold, and chicks that crowd away from it or pant are too hot. For piglets, huddling also signals cold.
Target temperatures for young poultry and piglets
The right output depends on species, age, ambient temperature, housing and mounting height. The figures below are common starting points from published guidance, not settings to apply blindly. Adjust lamp height according to what you measure and what the animals are doing.
| Chick age | Temperature (°F) | Approx. (°C) |
|---|---|---|
| Day 0 (hatch) | 90–95 | 32–35 |
| Day 7 | 85–90 | 29–32 |
| Day 14 | 80–85 | 27–29 |
| Day 21 | 75–80 | 24–27 |
Source: UC Cooperative Extension small-flock brooding presentation. Celsius values converted by us.
The same extension material recommends measuring with a thermometer at the center and at the edge of the brooder, and using a coloured bulb. A separate co-op guide stresses heating only part of the brooder so chicks can move to a cooler area, and securing the lamp with something more reliable than the built-in clamp.
For piglets the picture is different, because newborns have a high surface-area-to-weight ratio and little ability to regulate their own temperature. Research reviewed in Animals reports microclimate recommendations of 32–35 °C for piglets, while sows prefer about 19 °C. That gap is why a localized heat source beats warming the entire room. Government guidance from Queensland adds that piglets can die if ambient temperature falls below 16 °C, and that uncovered heat lamps can create floor-level draughts, so creep boxes or covers help hold warmth in. National Hog Farmer cites roughly 0.5 ft² of creep area per piglet.
Specifications to verify before you buy
Our product page for the livestock bulb is deliberately cautious. It says buyers should confirm rated wattage, voltage, base type and size, dimensions, service life and environmental ratings against the exact model, and should not assume a bulb is waterproof, shatterproof, safe for direct animal contact or compatible with every socket. We agree with that approach. For reference, the published range for our R40/R125 series is below.
| Parameter | Published range | What to check |
|---|---|---|
| Voltage | 120 V or 240 V | Must match your supply and the fixture rating. |
| Wattage | 125, 150, 175, 200, 250, 275 W | Never exceed the fixture's rated wattage. Treat wattage as a ceiling, not a target. |
| Base | E26 / E27 | Must match the socket type and size. |
| Length | 165 mm or 182 mm | Confirm it fits inside the guard and reflector. |
| Color | Red (clear glass variants also available) | Red is the usual choice for livestock housing. |
| Rated life | About 5,000 hours | Real life depends on switching, voltage and conditions. |
Source: Zhongrun R40/R125 product category page. Individual models differ, so always confirm against the model-specific sheet.
Glass type and coating
The glass and coating decide how a bulb behaves when something goes wrong, such as a splash, a knock or a temperature shock. We list several constructions, each with its own product page:
| Model | Construction | Consideration |
|---|---|---|
| R40 Natural Red Glass IR Lamp | Natural red glass | Red glass tint without a separate coating layer. |
| R40 IR Lamp TEFLON | Teflon-coated safety bulb | Marketed for environments where breakage is a concern. See the note below for bird housing. |
| R125 Red Infrared Lamp | Red-coated R125 | Larger R125 envelope. Check fixture size. |
| R125 Transparent Infrared Lamp | Clear glass | Gives off white light as well as heat. Not a red-lit environment. |
| R40/R125 Hard Glass IR Lamp | Hard (heat-resistant) glass | Suited to damper or splash-prone housing, subject to the model's rating. |
| BR40 Clear Hard Glass, Teflon Coating | BR40 reflector, hard glass, coating | BR-type body with a built-in reflector. Check fixture compatibility. |
A note on Teflon-coated bulbs and birds. Coated bulbs are sold to hold glass together if a bulb breaks, which is a real benefit in a pen. However, poultry-supply guidance advises buyers to double-check that a brooder bulb is not Teflon-coated. If you are brooding chicks or other birds, ask your supplier which construction they recommend for your species and fixture before ordering. For mammals such as piglets, follow the model's published rating.
Are heat lamps always the best choice?
No, and a useful buying guide should say so. Lamps remain popular because they are inexpensive, widely available and attract piglets to the warm area in the first days after birth. But the alternatives are worth weighing.
- Heat mats and plates. Studies summarized by National Hog Farmer found no difference in piglet productivity between lamps and heat mats. A semi-enclosed, radiantly heated microclimate used about 50% less energy than a traditional lamp. For brooding chicks, plates remove most of the fire risk and let chicks keep a natural day and night cycle.
- Enclosures and creep covers. These hold heat and cut draughts but make inspection and cleaning harder.
- Lamps used well. Where lamps are the practical option, such as lambing pens, temporary shelters or farms with limited power infrastructure, a quality lamp with a guard, a secure mount and protected wiring is a defensible choice.
The honest summary is that a lamp is a good tool when the setup around it is good, and a poor one when it is hung from baling twine over dry bedding.
Fire safety: the part that deserves the most attention
In a National Fire Protection Association study of U.S. barn fires from 2002 to 2005, fire departments responded to an estimated 1,090 barn structure fires per year. Almost a quarter were caused by heating equipment, and heat lamps were the leading item in that category. Cornell Small Farms and Ohio State extension both describe the same recurring causes: lamps that fall into bedding, poorly made fixtures, flammable mounting and unattended operation.
| Area | Recommended practice |
|---|---|
| Fixture | Use a good-quality fixture with a wire guard. Avoid cheap, poorly made lamps. |
| Mounting | Secure with a non-flammable chain or a proper clamp, never twine or rope. Do not rely on the clamp alone. |
| Clearance | Keep lamps a safe distance from anything that can burn. Never lay a lit lamp on a flammable surface. |
| Electrical | Use an arc-fault protected circuit where possible. NFPA advises against extension cords in the barn and says electrical equipment should be labeled for agricultural or commercial use. |
| Housekeeping | Remove dust and cobwebs from lights and outlets. Inspect bulbs for cracks and dust build-up. |
| Supervision | Do not leave lamps unattended, especially overnight. Turn them off once animals are warm. |
| Preparedness | Keep an ABC-type extinguisher in the barn, fit smoke detection, and use isolated buildings where practical. |
This table summarizes the sources and does not replace local fire codes or advice from your electrician or fire department.
A practical installation and daily-use routine
- Match bulb to fixture. Check voltage, wattage ceiling, base type and bulb length on both items before powering up.
- Plan the zones first. Make sure the pen has a warm area and a clearly cooler area, and that every animal in the litter or flock can fit under the heat at once.
- Mount securely and add a guard. Use a chain, keep the cord out of reach, and keep the lamp clear of bedding, wood and feeders.
- Start conservatively and adjust by measurement. In a small enclosure, a lower-wattage bulb leaves more room to fine-tune. Check temperature under the lamp and at the edge of the warm zone, then watch behavior for the next hour.
- Inspect daily. Look at the bulb, guard, cord, mount and bedding. Replace any bulb that is cracked, blackened or dusty.
- Step down as animals grow. Lower the output on schedule, for example by raising the lamp, and remove the lamp once animals no longer need supplemental heat.
About the manufacturer
Haining Zhongrun Lighting & Electronics Co., Ltd. is a Zhejiang-based manufacturer of specialty light sources and fittings. According to our company profile, the factory covers 20,000 square meters of land with more than 25,000 square meters of floor area, and our products are used in fields that include animal and plant breeding. We report more than 25 years of experience, customers in over 60 countries and regions, and a team of more than 150 employees. The company's site displays CE-LVD, CE-EMC and ISO 9001:2015 certificates, and we run our own testing lab. We are about 100 kilometers from Shanghai Port, and we can develop products to customers' drawings or samples.
For livestock use, you can browse the R40/R125 infrared heat lamps and the BR40/BR125 infrared heat lamps, or read about our animal breeding applications. More technical background is on our blog.
Frequently asked questions
Can I use a higher-wattage bulb to warm the pen faster?
Only if the fixture is rated for it. A higher wattage gives more output but also more fire risk and a greater chance of overheating animals. Increase height or adjust the setup first, and measure before changing the bulb.
How do I know whether the animals are comfortable?
Watch how they use the space. A spread of animals resting around the warm zone with free access to cooler areas is a good sign. Tight huddling suggests cold, and crowding away from the lamp or panting suggests heat.
Is a red bulb better than a clear one?
Extension guidance for small-flock brooding recommends a coloured bulb. Clear bulbs are also manufactured and are used where white light is acceptable or wanted, so choose according to your species and housing.
Can I request a custom specification?
Yes. We can develop products from drawings or samples. Send your voltage, wattage, base type and application through the contact page, by email at sales@zhongrun-light.com, or by phone at 0086-573-87266658. The address is No. 18 Changshan Road, Economic Development Zone, Haining, Zhejiang, China.
