What Is a Piglet Heat Lamp Used For?
A piglet heat lamp is a local heat source hung above the creep area in a farrowing house to keep newborn piglets warm. Newborn piglets have very little body fat and cannot regulate their own temperature well. Without a warm, dry creep area, they chill quickly, become weak, and are more likely to be crushed by the sow.
Unlike a heater that warms the whole barn, a piglet heat lamp creates a warm zone in one part of the pen. Piglets move in and out of this zone as they need. This lets them warm up after nursing, then return to the sow when they are ready. The National Pork Board states that piglets require a dry, draft-free environment at 32.2–35°C (90–95°F), while sows prefer 15.5–18.3°C (60–65°F), which is why localized heating at the creep area is necessary.
Farmers use a piglet heat lamp for:
- Warming newborn piglets in the first days after birth
- Creating a creep area away from the sow
- Keeping piglets warm during cold weather or in poorly insulated barns
- Supporting small or weak piglets that struggle to compete
- Reducing chilling and piglet mortality in the farrowing house
A piglet heat lamp is not designed to heat an entire farrowing room. It works best when the creep area is draft-free, dry, and separated from the sow by a creep barrier.
How Warm Should a Farrowing Pen Be?
Piglet comfort temperature is measured at piglet level in the creep area, not at the height of a wall thermometer.
| Piglet Age | Target Creep Area Floor Temperature | What You Should See |
|---|---|---|
| Day 1–3 | 34–36°C (93–97°F) | Piglets lie calm and spread under the lamp between nursing |
| Week 1 | 34°C (93°F) | Piglets use the creep area regularly, then return to the sow |
| Week 2 | 27°C (81°F) | Piglets spend more time away from the lamp |
| Week 3 | 25°C (77°F) | Piglets use the lamp mainly after feeding or at night |
| Week 4 | 22–25°C (72–77°F) | Piglets rely on the lamp less, weaning preparation begins |
The day before farrowing begins, barn temperature should be adjusted to about 22°C, and heat lamps should be turned on so the floor in the pens reaches 34–36°C before the first pig is born. A study published through FAO AGRIS evaluated floor temperatures provided by radiant heat lamps and recommended 34°C, 27°C, and 25°C for weeks 1, 2, and 3, respectively.
These numbers are a starting point. The sow’s comfort temperature is much lower than the piglet’s. A farrowing house that is comfortable for the sow is usually too cold for newborn piglets.
Watch piglet behavior:
- Piglets piled tightly under the lamp: too cold — lower the lamp or increase wattage.
- Piglets spread far from the lamp and lying on their sides away from the creep area: too hot — raise the lamp or reduce wattage.
- Piglets lying in a loose group with some under the lamp and some near the sow: temperature is about right.
- Piglets shivering or lying on top of each other away from the lamp: the creep area itself may be drafty or wet.
A wet, drafty creep area cannot be fixed by adding more wattage. Dry bedding and a draft barrier matter as much as the lamp.
How High Should You Hang a Piglet Heat Lamp?
Hanging height controls how much heat reaches the piglets. A lamp hung too low overheats the creep area. A lamp hung too high leaves piglets chilled.
NC State Extension notes that heat lamps are typically suspended 2 to 4 feet above the floor, and that the closer the lamp is to the floor, the higher the floor temperature but the smaller the heated area. For piglets specifically, one study used a 175W heat lamp suspended 76 cm (30 in.) above the creep area for localized heat. Another source recommends that heat lamp units be suspended at least 60 cm higher than the animals to prevent fire risk and overheating.
As a general starting point for the first week:
- Hang the lamp about 60–75 cm (24–30 inches) above the creep area floor.
- Adjust within the first few hours based on piglet behavior.
- Raise the lamp gradually as piglets grow and need less heat.
Hanging height also depends on wattage. A 250W bulb produces more heat than a 150W bulb, so it needs to hang higher to reach the same piglet-level temperature. Using a lamp with an adjustable hanging ring or chain makes it easy to change height without changing the bulb.
What Wattage Do Piglets Need?
Wattage choice depends on creep area size, barn insulation, climate, and hanging height.
| Wattage | Best For | Notes |
|---|---|---|
| 150W | Small creep areas, well-insulated farrowing rooms, mild weather | Good for a single litter in a covered creep area |
| 200W | General farrowing houses, medium creep areas | Good for most indoor farrowing pens |
| 250W | Cold barns, open farrowing pens, large creep areas | Needs higher hanging height to avoid overheating |
A 250W infrared lamp supported 36 inches above the floor prevents chilling of newborn pigs in pen temperatures above 30°F. If the pen temperature is between 15°F and 30°F, two lamps may be needed.
Chick count or piglet count matters, but creep area size and insulation matter more. A small litter in a large open pen will struggle to stay warm even with a 250W lamp. In that case, reduce the creep area with a solid barrier before increasing wattage.
More wattage is not always better. A 250W lamp hung too low can overheat piglets quickly, causing dehydration and weakness. Always start with the lower wattage that matches your farrowing house, then adjust height rather than jumping to a higher wattage.
Red vs White Bulb for Piglets
Both red and white bulbs provide heat. The difference is how the light affects piglet behavior and your ability to observe them.
| Bulb Color | Best Use | Considerations |
|---|---|---|
| Red | Night heating, reducing disturbance, keeping piglets calm | Less visible light; harder to observe piglet skin color and droppings |
| White | Daytime heating, close observation, checking piglets | Brighter light; may disturb sow and piglets if left on all night |
Red heat lamps emit about 75% less light than white variants, but the infrared radiation and heat they emit are equal to white bulbs. White bulbs have been developed specifically for use in pigs and poultry, while red ones are suitable for all types of animals. Many pig producers use red bulbs at night and white bulbs during the day. Red light is less likely to disturb the sow’s rest and may keep piglets calmer in the creep area.
Bulb surface also matters. Clear bulbs give more concentrated light and heat. Frosted bulbs soften the light and spread heat more evenly. In a small creep area, frosted may reduce hot spots. In a large pen, clear may reach the edges better.
How Long Do Piglets Need a Heat Lamp?
Most piglets need supplemental heat for 3–4 weeks, depending on weaning age, climate, and barn conditions.
Signs that piglets are ready to reduce heat:
- Piglets spend most of the day away from the lamp
- Piglets are eating solid feed and drinking well
- Nighttime temperatures in the creep area stay above 22°C (72°F)
- Piglets are growing evenly without huddling
Reduce heat gradually. Raise the lamp a little each week, or switch to a lower wattage. Do not turn the lamp off suddenly. A sudden drop in temperature can chill piglets, especially at night.
A study from Iowa State University found that piglets spent more time in heated areas as they aged, and that a variable-output heat lamp would be more suitable than a constant-output heat lamp to accommodate their progressively decreasing thermal needs.
Common Mistakes When Using a Piglet Heat Lamp
Most farrowing house problems come from a few avoidable mistakes.
- Hanging the lamp too low: overheats piglets, causes dehydration, and increases fire risk.
- Hanging the lamp too high: piglets chill, huddle, and stop nursing.
- Using the wrong wattage: too much heat in a small creep area, or not enough in a cold barn.
- Not securing the lamp: a swinging or falling lamp can injure piglets and start a fire. MS Schippers recommends suspending the lamp at least 60 cm higher than the animals and regularly checking for damage to the electrical cable.
- Dusty bulb surface: dust blocks heat output. Regularly remove dust from the fixture.
- No spare bulb: a burnt-out bulb at night can chill the whole litter before morning.
- Keeping the lamp on 24 hours without adjustment: piglets need a cooler area to move to.
- Ignoring drafts: a lamp cannot compensate for cold air blowing directly into the creep area.
- Placing the lamp too close to bedding or curtains: a serious fire hazard. A protective mesh guard under the bulb helps prevent direct contact between the heat lamp and animals or fire-risk objects.
- Not cleaning the creep area: wet bedding reduces the effect of any heat lamp.
When a Heat Lamp Is Not Enough
A piglet heat lamp works well for most farrowing houses. But it has limits.
- Very cold or drafty barns: a single lamp cannot hold heat in an open pen. You may need a heated creep area, a brooder, or additional insulation.
- Large litters: a single lamp covers a limited area. Research from NC State University found that piglets with two heat lamps spent 4.8 hours more per day in the heated areas than piglets with one heat lamp.
- Precise temperature control: a manual lamp cannot maintain a set temperature. For high-value breeding or weak piglets, a thermostat-controlled heat mat or creep heater is more reliable.
- Power outages: a heat lamp depends on electricity. In areas with unstable power, a backup heat source is important.
- Fire risk in dry barns: in very dry, dusty environments, a heat mat or brooder may be a safer option than an open heat lamp.
A piglet heat lamp is a practical tool, not a complete farrowing house heating system. It works best when combined with a draft-free creep area, clean dry bedding, good ventilation, and regular observation.
Final Takeaway
A piglet heat lamp is one of the simplest and most effective tools for reducing piglet chilling and pre-weaning mortality. The key is not the lamp itself, but how you use it. Get the height right. Match wattage to creep area size and barn temperature. Watch piglet behavior instead of relying only on temperature numbers. Use red light at night and white light for observation. Keep a spare bulb. And know when a lamp alone is not enough.
Piglets that are warm, dry, and evenly spread out in the creep area are piglets that nurse, grow, and survive.
Common Questions
A heat lamp designed for livestock use can work for both, but the setup is different. Piglets need a larger creep area and a higher hanging height than chicks. NC State Extension notes that heat lamps for pigs are typically suspended 2 to 4 feet above the floor. Wattage and height must be adjusted for the animal.
Keep a spare bulb in the farrowing house at all times. A burnt-out bulb at night can chill the whole litter before morning. Replace the bulb as soon as possible using the same wattage and type. Never use a higher-wattage bulb than the lamp is rated for.
In hot weather, piglets may need less heat or none at all after the first week. Watch behavior. If piglets spread far from the lamp and lie on their sides away from the creep area, reduce heat or turn the lamp off during the day. At night, temperatures may still drop enough to need some heat, especially for newborn piglets.
Piglets will move away from the lamp, lie spread out, or avoid the creep area entirely. They may also pant or become restless. Raise the lamp or switch to a lower wattage. Always check piglet behavior, not just the temperature reading.
A regular light bulb does not produce enough focused heat for a farrowing house. It may also shatter more easily and does not have the reflective shade or guard that a livestock heat lamp provides. Use a bulb designed for heat lamps and rated for the wattage of the lamp.
Newborn piglets need heat available at all times, especially in the first week. But the lamp should not cover the entire creep area. Piglets need a cooler section to move to if they get too warm. Adjust the lamp height or position so piglets can choose their own comfort zone.
Hang the lamp securely with a chain or wire, not just the cord. Keep it away from bedding, curtains, and other flammable materials. Clean dust off the bulb regularly. MS Schippers recommends suspending the lamp at least 60 cm higher than the animals and using a protective mesh guard under the bulb. Never place the lamp directly on the floor or on bedding.
Wait until piglets are eating solid feed well, growing evenly, and spending most of the day away from the lamp. This is usually around 3–4 weeks, depending on weaning age and barn temperature. Move gradually. If piglets huddle or shiver at night, they may still need some heat.
References
- Pork Checkoff. Comparing Heat Lamp vs. Heat Mat for Farrowing Crate Heating. https://porkcheckoff.org/research/comparing-heat-lamp-vs-heat-mat-for-farrowing-crate-heating/
- 3tres3. A Piglet’s First Week of Life. https://www.3tres3.com/en/guide333/companies/tonisity_1/posts/9075
- FAO AGRIS. Static Space Requirements for Piglet Creep Area as Influenced by Radiant Temperature (Wheeler et al., 2008). https://agris.fao.org/search/en/records/65df2d4063b8185d9cab547a
- NC State Extension. Heat Sources for Post-Weaning Pigs. https://content.ces.ncsu.edu/heat-sources-for-post-weaning-pigs
- NC State Extension. Effects on Farrowing: Stall Size and Heat Lamps. https://swine.ces.ncsu.edu/news/effects-on-farrowing-stall-size-and-heat-lamps/
- Iowa State University Digital Repository. Effects of Farrowing Stall Layout and Number of Heat Lamps on Sow and Piglet Production Performance (Leonard et al., 2020). https://dr.lib.iastate.edu/handle/20.500.12876/819
- MS Schippers. MS Lamp unit high quality, 2.5 m — Heating lamps. https://www.msschippers.com/
- MS Schippers. Interheat Smart lamp holder automatic 2,5 m EU, p/10. https://www.msschippers.com/
- MS Schippers. Philips heat lamp HG white 250W — Heating lamps. https://www.msschippers.com/
- Michigan State University Extension. Management over Medication: Wintering your small swine facility. https://www.canr.msu.edu/