Farm Animal Heat Lamps: How to Choose, Install and Run Them Safely
A farm animal heat lamp does one job: it gives young or recovering animals a warm place to rest while their own bodies cannot hold temperature. Chicks, piglets, lambs and kids all benefit. The lamp itself is rarely the problem. Most failures come from how it is hung, powered and measured: the wrong height, no thermometer at animal level, a fixture that can fall, or a pen with no cool area to escape to.
Key takeaways
- An infrared lamp warms the animals and surfaces it shines on, not the whole room. Always create a warm zone and a clearly cooler zone.
- Set temperature with lamp height and a thermometer at animal level. Wattage alone does not tell you the temperature.
- Use the lowest wattage that holds your target. The fixture's rating is a hard ceiling, and extension guidance summarized by Zhongrun advises against bulbs above 250 W in livestock barns.
- Setup matters more than brand: chain mount, wire guard, direct outlet connection, clean fixture and a nearby extinguisher.
- Before ordering, confirm voltage, base, length and glass type on the exact model page.
How an infrared heat lamp warms animals
Current passes through a filament sealed in glass, and the filament gives off mostly infrared energy. That energy is absorbed by the first surface it meets: feathers, skin, bedding, flooring. The air warms slowly, while the animal under the beam warms quickly.
This is the lamp's main advantage on a farm. A newborn that cannot regulate its own temperature gets a concentrated warm spot, and the rest of the building can stay cooler. It is also the reason a lamp needs a gradient: the spot directly underneath is warmest, and temperature falls toward the edges. If the whole pen is uniformly hot, the lamp is too strong or the pen is too small.
Choosing a lamp family: R40/R125, BR40/BR125, PAR38 and R95
Zhongrun manufactures four infrared heat lamp families plus reptile lamps. The shape code tells you how the bulb is built and how it directs heat. Table 1 compares them using each category page's published information.
| Family | Published model variants | Typical farm use | Check before ordering |
|---|---|---|---|
| R40/R125 | Natural Red Glass, TEFLON, R125 Red, R125 Transparent, Hard Glass, Hard Glass Red Coating | General-purpose heat for chick brooders and small pens | R125 is the larger envelope; confirm it fits the guard and reflector |
| BR40/BR125 | BR40, BR40 (red), BR125, Soft Glass, Hard Glass, Teflon Coated | Focused heat over a creep, lambing or calf corner (reflector-type body) | Soft versus hard glass; fixture compatibility |
| PAR38 | New Sun Lamp, PAR38 (red), Hard Glass Anti Explosion, Hard Glass Red Paint | Directional spot heat in a tight corner or small enclosure | The category page describes white light, while the hard-glass models list red; confirm colour per model |
| R95 | Natural Red Soft Glass, Physical Therapy Lamp | Compact fixtures and recovery areas | Only two models listed; one is a therapy lamp, so confirm suitability |
Source: Zhongrun category pages, accessed October 2026. Individual models differ, so always confirm against the model-specific page.
Electrical and physical specifications
The R40/R125, BR40/BR125, PAR38 and R95 category pages publish the same ranges:
- Voltage: 120 V or 240 V. A 120 V lamp on a 240 V supply will fail almost immediately, so check the marking against your measured supply.
- Wattage: 125, 150, 175, 200, 250 and 275 W (individual product pages list these as pairs, for example 125/150 W).
- Base: E26 or E27.
- Length: 165 mm or 182 mm.
- Rated life: about 5,000 hours.
Note the tension between the product range and safety guidance. Zhongrun sells 275 W lamps, yet extension guidance summarized in its animal heating guide cautions against bulbs above 250 W in barns. Treat the top of the range as a specialist option, and never exceed the rating printed on your fixture.
Glass, coating and colour
- Soft glass suits dry, still, indoor use. Hard glass tolerates thermal shock better where a splash or draught could reach a hot bulb, such as the R40/R125 Hard Glass IR Lamp or the BR40/BR125 Hard Glass IR Lamp.
- Anti-explosion and shatter-resistance claims appear on pages such as the PAR38 Hard Glass IR Lamp Anti Explosion. These are manufacturer descriptions, and the pages cite no test standard. Ask for the datasheet and any test evidence, and keep a guard on the fixture regardless.
- Teflon-coated bulbs, such as the R40 IR Lamp TEFLON, are sold to hold fragments together if a bulb breaks. Zhongrun's own livestock guide notes that some poultry-supply guidance advises double-checking that a brooder bulb is not Teflon-coated, so confirm with your supplier and veterinarian before using one around birds.
- Red versus clear: red mainly reduces glare. Compare lamps by wattage and construction when you need more heat, not by colour.
Temperature targets to start from
Targets depend on species, age, housing and draught. The figures in Table 2 are starting points, not settings to apply blindly. Measure at animal level, then let behaviour decide the final setting.
| Animal and age | Starting target | How it changes |
|---|---|---|
| Chicks, week 1 | 90–95°F (32–35°C), measured about 2.5 in above the litter under the lamp hood | Lower by about 5°F (3°C) each week by raising the lamp; remove once the temperature under it is 65–70°F or matches the surroundings |
| Piglets, birth to about 3 weeks | 32–35°C is commonly quoted as air temperature at piglet level; sows prefer about 19°C | Published targets vary by study and fall with age; one study reports 30–32°C at birth |
| Lambs, calves, kids | No single figure applies | Confirm the target for your breed and housing with your veterinarian or extension adviser, then use a thermometer and behaviour |
Piglet figures come from research and industry guidance summarized in Zhongrun's piglet guide, not from a source reviewed directly for this article. Verify them with your veterinarian.
Read the animals, not just the thermometer
- Huddled tightly under the lamp: too cold, or a draught. Block draughts, lower the lamp slightly and re-measure at animal level.
- Crowded away from the lamp, or panting: too hot, or no cool area. Raise the lamp or use a lower wattage.
- Spread out, resting and moving freely: about right. Keep checking.
Treat any calendar schedule as a starting point. A draughty shed may justify more heat in week five, while a warm insulated room may need less in week four.
Installing a heat lamp: a practical routine
- Match bulb to fixture. Check voltage, wattage ceiling, base type and bulb length on both before powering up.
- Plan the zones first. Put the warm zone over one end of the pen or brooder and keep feed and water in the cooler area. Make sure every animal in the litter or flock can fit under the heat at once.
- Mount it as if permanent. Use a non-flammable chain with a locking connector or a purpose-made clamp. Never use twine or rope, and do not rely on the lamp's own cord or clip alone.
- Add a guard and keep clearance. Fit a wire guard, and start at least 20 inches (about 50 cm) from bedding and newborns, the figure cited in extension guidance summarized by Zhongrun.
- Plug in directly. Avoid extension cords. Extension guidance recommends a circuit with ground-fault and arc-fault protection that is not overloaded.
- Start higher, then adjust. Place a thermometer at animal level under the beam, wait for the reading to settle, then lower the lamp in small steps.
- Step the heat down as animals grow. Raise the lamp or reduce wattage on schedule, and remove it when animals no longer need supplemental heat.
Fire and electrical safety
Heat lamps are inexpensive and effective, which is exactly why their fire record deserves attention. Penn State Extension reports that heating equipment was the leading cause of barn fires in 2006–2010 NFPA data, and recommends cleaning dust and cobwebs from lights and heat sources, using bulb covers and inspecting wiring yearly. NDSU Extension adds that lamps raise risk most over deep, bedded straw, and that an animal bumping a lamp or chewing a cord can start a fire within minutes.
- Hardware: use a heavy-duty fixture and a thick-glass bulb built to survive a fall. Replace any cracked or blackened bulb, and any socket or cord that looks brittle or discolored.
- Housekeeping: clean the lamp and fixture when cool, before each brood or season.
- Supervision: check lamps every day, several times a day, as NDSU recommends.
- Preparedness: keep a 10-pound ABC-rated extinguisher near each barn entrance and consider smoke or temperature monitoring.
- Wash-down: switch off at the supply and let the bulb cool before washing, to avoid thermal shock on hot glass.
This summary does not replace local fire codes or advice from your electrician or fire department.
Are lamps always the best choice?
No. A lamp is a temporary heat source, not a permanent heating system. Where you cannot supervise, or you work in a barn full of hay and bedding, radiant plates, heat mats or an enclosed brooder may be safer. Zhongrun's piglet guide, summarizing National Hog Farmer, notes studies that found no productivity difference between lamps and heat mats for piglets. Lamps remain a defensible choice for lambing pens, temporary shelters and short brooding periods, provided the guard, mount and wiring are right.
Running cost: energy matters more than the bulb
Energy use is easy to estimate: kilowatts × hours. A 250 W lamp running around the clock uses 0.25 kW × 24 h = 6 kWh per day, or 84 kWh over a 14-day brooding period. A 175 W lamp uses 4.2 kWh per day, or 58.8 kWh over the same period, which is 30% less. At an assumed price of $0.15 per kWh (replace with your own tariff), that is about $12.60 versus $8.82.
A rated life of about 5,000 hours equals roughly 208 days of continuous use, so one bulb usually covers several broods. Real life depends more on switching, voltage fluctuation, moisture and wash-downs than on the rating. Choosing the lowest effective wattage and raising the lamp on schedule saves more than shopping for the cheapest bulb.
About the manufacturer and how to order
Haining Zhongrun Lighting & Electronics Co., Ltd. is a Zhejiang-based manufacturer of professional light sources and fixtures, focused on infrared and UV lamps. The following facts are company-reported on its About page, so verify any that matter to your purchase:
- More than 25 years of experience, with customers in more than 60 countries and regions.
- A factory on 20,000 m² of land with more than 25,000 m² of floor area, and over 150 employees.
- An in-house testing lab, and a location about 100 km from Shanghai Port.
- Development to customer drawings or samples.
- CE-LVD, CE-EMC and ISO 9001:2015 certificates displayed on the site. Ask which one covers your specific model and market, and request a copy.
Warranty terms, minimum order quantity and lead time are not published on the site, so ask when you inquire. A sensible approach is to order samples and test them in one pen before buying in bulk. Send your supply voltage, target wattage, base type and pen layout through the contact page, by email at sales@zhongrun-light.com, or by phone at 0086-573-87266658. The site states that inquiries receive a reply within 12 hours on working days. Browse the full product range, or see the Animal Breeding and Animal Care application pages.
Frequently asked questions
What wattage is best for a farm animal heat lamp?
There is no universal answer. Pick the lowest wattage that holds your target at animal level without exceeding the fixture's rating. Many livestock fixtures are rated to 175 W or 250 W, and extension guidance advises against bulbs above 250 W in barns.
How high should I hang the lamp?
Start at least 20 inches (about 50 cm) from bedding and animals, then adjust in small steps with a thermometer at animal level. Room temperature, wattage and pen size all change the right height.
Is a red bulb warmer than a clear one?
No. Heat output depends on wattage and construction. Red mainly reduces visible glare, which many keepers prefer in animal housing. Compare the R125 Red Infrared Lamp and the R125 Transparent Infrared Lamp by wattage, not colour.
Can I leave a heat lamp on all night?
Young animals often need heat around the clock in the first days, but risk is highest when nobody is watching. Use a guard, a secure chain mount, a clean fixture and a direct outlet connection, and inspect the setup at every check, day and night.
Do reptiles need the same lamps?
Not entirely. Infrared lamps provide heat but not UVB, which many reptiles also need. See the reptile lamp category for UVB and ceramic options, and the ceramic heat lamp guide for flameless night heating.
