Swine Barn Lighting Requirements and Management

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Photoperiod is a critical reproductive management tool for gilts and sows, requiring 14-16 hours of light daily at 100-150 lux to optimize estrus cycling, conception rates, and litter size. Boars also benefit from this long-day schedule to maintain semen volume and quality.
• Grow-finish pigs require shorter photoperiods (8-12 hours) and lower light intensity (40-80 lux) to promote rest and reduce stress and aggression, as continuous light offers no growth advantage and can increase cortisol levels.
• Light quality is measured in lux at pig eye level, not watts at the fixture, necessitating the use of a light meter to ensure adequate and uniform coverage, avoiding dark corners and hot spots.
• LED technology is the preferred choice for swine barns due to its energy efficiency (50-70% less than fluorescent), extended lifespan (50,000+ hours), and superior performance in cold and humid conditions, with IP65 or higher ratings recommended for washdown areas.
• Consistent photoperiod management is best achieved through automated timers or controllers, preventing human error and ensuring predictable light-dark cycles crucial for animal welfare and performance, with separate task lighting for workers preserving the pigs' dark rest period.
• Regular monitoring and recordkeeping are essential, including monthly fixture inspections, quarterly lux meter readings at pig eye level, and logging photoperiod settings to identify and rectify issues that could impact herd health and productivity.

Lighting is one of the most overlooked environmental factors in swine production, yet it directly affects reproduction, growth, behavior, and worker safety. This guide covers the full scope of swine barn lighting, from photoperiod science to fixture selection, installation, and management. It is written for swine producers, farm managers, and employees who want practical, actionable information on how to light a barn correctly for both pigs and people.

At a Glance

• Photoperiod matters for reproduction. Gilts and sows need 14 to 16 hours of light per day at 100 to 150 lux to maintain optimal reproductive performance. Boars benefit from the same schedule.
• Grow-finish pigs do not need long days. Provide 8 to 12 hours of light at 40 to 80 lux for normal growth and behavior. Continuous light does not improve gain and can increase stress.
• Light quality is measured in lux, not watts. Use a light meter to verify intensity at pig eye level, not at the fixture. What looks bright to a human may be dim for a pig.
• LED is the preferred technology. LEDs last longer, use less energy, handle cold and humidity better, and dim cleanly. Fluorescent and incandescent remain workable but cost more over time.
• Place fixtures for even coverage. Space lights so the darkest point between fixtures stays above your minimum target. Avoid dark corners and hot spots.
• Add task lighting for workers. Separate circuits for inspection, cleaning, and veterinary work prevent pigs from losing their dark rest period.
• Use timers or controllers. Manual switching leads to inconsistent photoperiods. A simple timer removes the human error.
• Monitor and record. Check light output monthly, replace failing tubes or diodes, and log your photoperiod settings. Written records help you troubleshoot when performance drops.

Why Swine Barn Lighting Matters More Than You Think

Many producers treat lighting as an afterthought. They install whatever fixtures were on sale and never measure the result. This approach costs money in wasted electricity, reduced reproductive performance, and higher injury risk for workers. Swine barn lighting is not just about being able to see. It is a biological management tool with measurable effects on the herd.

Pigs are not like cattle or horses in their light response. They do not have a strong seasonal breeding pattern when housed indoors, but they do respond to day length. The sow's reproductive system uses photoperiod as a signal. When you control the light-dark cycle, you control that signal. Sows and gilts exposed to 14 to 16 hours of light followed by 8 to 10 hours of darkness show more regular estrus cycles, higher conception rates, and larger litters compared to pigs kept in short days or constant dim light.

Boars respond too. Semen volume and sperm quality improve when boars receive a consistent long-day photoperiod. Constant light, however, is harmful. It disrupts the natural rhythm and can lead to lethargy and reduced libido.

For grow-finish pigs, the photoperiod is less critical for performance, but it still matters. Pigs kept in constant light show more restlessness and aggression. They also have higher cortisol levels, which indicates stress. Providing a dark period of at least 8 hours allows pigs to rest and reduces behavioral problems.

Lighting also affects human performance. A worker who cannot see clearly is more likely to make mistakes during sorting, vaccination, and heat detection. Poor lighting in alleys and around gates creates slip and fall hazards. Dimly lit farrowing rooms make it harder to notice a sow in trouble or a piglet being crushed. Good lighting is a safety feature, not just a convenience.

Understanding Light Measurement and Pig Vision

Before you can manage lighting, you need to understand how it is measured. The most common unit is the lux, which measures the amount of light falling on a surface. One lux equals one lumen per square meter. A lumen measures the total visible light emitted by a source. When you buy a bulb, the package lists lumens, not lux. The lux you actually get depends on the distance from the fixture, the reflector design, and the room geometry.

Pig eye sensitivity differs from human eye sensitivity. Pigs are dichromats, meaning they have two types of color receptors compared to the three in humans. They see blues and greens well but have limited red perception. This matters less for general barn lighting than you might think because most tasks do not depend on fine color discrimination. It matters for red light use during night checks. Pigs perceive red light as dimmer than humans do, so if you use red light for nighttime observation, you may need more intensity than you expect.

Pig vision is also adapted for low light. Pigs have a reflective layer behind the retina called the tapetum lucidum, which improves their ability to see in dim conditions. This means a barn that looks dim to you may be perfectly adequate for the pigs. The reverse is also true. A barn that looks bright to you may be overwhelming to pigs if it runs 24 hours a day.

The practical takeaway is simple. Do not rely on your eyes to judge whether a barn has enough light. Use a light meter. Handheld lux meters are inexpensive and easy to operate. Place the sensor at pig eye level, which is roughly 12 to 18 inches above the floor for grow-finish pigs and about 24 inches for adult sows standing. Take readings at multiple points across the pen or stall, including the corners and along the feed trough. The minimum reading at the darkest point should meet your target. The average reading will usually be higher, but the minimum is what matters for performance.

Photoperiod Requirements by Production Stage

Different groups of pigs have different light needs. You cannot run one lighting schedule for the entire barn and expect optimal results. Here are the recommended targets by production stage.

Gestating Sows and Gilts

Gestating sows and developing gilts need a long-day photoperiod of 14 to 16 hours of light followed by 8 to 10 hours of darkness. Light intensity should be 100 to 150 lux at the sow's eye level. This schedule mimics summer day length and keeps the reproductive axis active.

For gilts, start the long-day photoperiod at least 2 to 3 weeks before the first expected estrus. This gives the endocrine system time to respond. For sows, maintain the long-day schedule throughout gestation. Do not reduce the photoperiod during late gestation. Some producers shorten the light period after weaning thinking it will help sows rest, but this can delay the return to estrus.

Farrowing Sows

Farrowing rooms should run the same 14 to 16 hour photoperiod as gestation. The light intensity can be slightly lower, around 100 lux, but the schedule should stay consistent. A sudden change in photoperiod at farrowing adds stress to an already demanding situation.

One caution applies to farrowing rooms. Piglets are sensitive to heat, and bright lights can add a small amount of radiant heat to the creep area. This is rarely a problem with LED fixtures, which produce little heat, but it matters with incandescent or halogen bulbs. If you use heat lamps for piglets, position them separately from the general room lighting so you can control each independently.

Boars

Boars need the same long-day photoperiod as sows, 14 to 16 hours of light at 100 to 150 lux. This maintains semen production and libido. Boars housed in constant light may show reduced mating behavior over time. Boars housed in short days produce lower semen volumes. Keep the boar stud on a consistent schedule year round, including weekends and holidays.

Grow-Finish Pigs

Grow-finish pigs do not need long days. A photoperiod of 8 to 12 hours of light at 40 to 80 lux is sufficient. The lower light level is fine because these pigs are not doing reproductive work. Their eyes adapt to the lower intensity, and they rest better during the dark period.

Do not run grow-finish lights continuously. Research has shown no growth benefit from 24 hour lighting, and some studies indicate increased activity and aggression. Pigs need darkness to establish a normal rest pattern. If your barn has no windows, the dark period must be total, not just dimmed lights.

Nursery Pigs

Nursery pigs fall between the breeding herd and grow-finish in their needs. A 12 hour photoperiod at 80 to 100 lux works well. The slightly higher light level helps workers observe piglet health and feeding behavior during the first weeks after weaning. Keep the schedule consistent to reduce stress during the transition.

Light Sources and Fixture Selection

The type of light source you choose affects energy cost, maintenance frequency, light quality, and fixture longevity. Here is a comparison of the main options.

LED Lighting

LED is the best choice for new installations and most retrofits. LEDs use about 50 to 70 percent less electricity than fluorescent tubes and 80 to 90 percent less than incandescent bulbs. They also last much longer. A quality LED fixture rated for agricultural use can run 50,000 hours or more, which means years of service in a barn that runs 16 hours per day.

LEDs handle cold temperatures well. They start instantly in freezing conditions, unlike fluorescents, which struggle in cold weather. They also tolerate humidity and dust better when they have an appropriate IP rating. Look for fixtures rated IP65 or higher for washdown areas. The IP rating indicates resistance to dust and water. An IP65 fixture is dust-tight and protected against water jets, which makes it suitable for pressure washing.

LED fixtures come in color temperatures measured in Kelvin. Lower Kelvin numbers produce warm yellow light, around 2700K to 3000K. Higher numbers produce cool white or bluish light, around 5000K to 6500K. For swine barns, a color temperature of 4000K to 5000K works well. It appears bright and clean to workers without being harsh. Some producers prefer 5000K for farrowing rooms to spot jaundice in piglets, but 4000K is adequate for most tasks.

LEDs also dim cleanly with the right driver. This allows you to install a dimming system for dawn and dusk transitions, which can reduce startle responses in pigs. Not all LED fixtures are dimmable, so check the specifications before purchase.

Fluorescent Lighting

Fluorescent tubes have been the standard in swine barns for decades. They are cheaper to buy than LEDs, but they cost more over time because they use more electricity and need more frequent replacement. A typical fluorescent tube lasts 10,000 to 20,000 hours, far less than an LED.

Fluorescents are also sensitive to cold. In unheated barns or during winter, they may flicker or fail to start. This is a serious drawback for grow-finish barns that rely on natural ventilation and may drop below freezing at night.

Fluorescent tubes contain small amounts of mercury, which creates disposal concerns. Broken tubes in a barn also expose pigs to shattered glass and mercury vapor. This makes fluorescents less safe than LEDs in a rough environment.

If you already have fluorescent fixtures, you can retrofit them with LED tubes. This is a cost effective upgrade. You replace the tube and sometimes the ballast, but keep the housing. LED replacement tubes last much longer and use less energy. Check whether your existing ballast is compatible with the LED tube you choose. Some LED tubes are ballast compatible, while others require you to bypass the ballast.

Incandescent and Halogen

Incandescent bulbs are inefficient and short lived. They convert most of their energy into heat rather than light. In a swine barn, that heat is usually wasted and can overheat the room in summer. Incandescent bulbs last only 750 to 2,000 hours, which means frequent replacement in a 16 hour per day operation.

Halogen bulbs are a slightly improved version of incandescent, but they still run hot and use more electricity than LEDs. They are rarely the right choice for general barn lighting. Their main use in swine barns is for localized heat lamps in farrowing crates and nurseries, where the heat output is part of the purpose.

High-Intensity Discharge

High-intensity discharge lamps, including metal halide and high-pressure sodium, were once common in large swine barns. They produce a lot of light from a single fixture, which reduces the number of fixtures needed. However, they have serious drawbacks.

Metal halide lamps take several minutes to reach full brightness after being turned on. This makes them unsuitable for motion-activated lighting or for areas where you want to switch lights on and off frequently. They also contain mercury and require special disposal. High-pressure sodium lamps produce an orange light that makes it hard to judge pig color and health.

Most producers are replacing HID fixtures with LEDs. The energy savings and instant start capability of LEDs make them the clear winner. If you still have HID fixtures, plan to retrofit them as they fail.

How to Design a Swine Barn Lighting Layout

Designing a lighting layout is not complicated, but it requires some planning. The goal is to provide even, adequate light across the working areas while avoiding dark zones and excessive brightness. Here is a step by step process.

Step 1: Determine the Target Lux

Start with the recommended intensity for your production stage. Breeding and gestation barns need 100 to 150 lux at pig eye level. Grow-finish barns need 40 to 80 lux. Farrowing rooms need 100 lux. Write down your target before you do anything else.

Step 2: Measure the Room

Measure the length, width, and ceiling height of the room. Draw a simple floor plan on graph paper or a spreadsheet. Mark the locations of pens, stalls, alleys, feed lines, and waterers. Note any obstructions such as support columns, feeders, or ventilation ducts that could block light.

Step 3: Select Fixtures

Choose fixtures based on your room conditions. For washdown areas, select fixtures with an IP65 or higher rating. For dusty feed rooms, choose fixtures that are sealed against dust ingress. LED fixtures with a 4000K to 5000K color temperature are the default choice.

Note the lumen output of the fixture. A typical 100 watt equivalent LED fixture produces about 10,000 to 15,000 lumens. A 150 watt equivalent produces 18,000 to 22,000 lumens. Higher lumen output allows wider spacing, but it also creates more glare if the fixture is aimed wrong.

Step 4: Calculate Spacing

A common rule of thumb is to space fixtures at a distance equal to 1.5 to 2 times the mounting height above the target surface. If your ceiling is 10 feet high and the target surface is at 4 feet, the mounting height is 6 feet. Spacing of 9 to 12 feet between fixtures would work.

This rule assumes the fixture distributes light evenly in a wide pattern. If you use fixtures with narrow beam angles, such as spotlights, reduce the spacing. If you use high bay fixtures with wide reflectors, you can increase spacing.

Step 5: Position for Coverage

Place fixtures so that the light overlaps between units. The darkest point, which is usually midway between fixtures, should still meet your target lux. In practice, this means you will need more fixtures than you might expect. A common mistake is to install fixtures only over the alleys, leaving the pens in shadow. Pigs spend most of their time in the pens, so the pens need the light.

Step 6: Add Task Lighting

General barn lighting provides the base level. Task lighting provides extra intensity for specific jobs. Install separate task lights over sorting chutes, treatment areas, and scales. Use a separate circuit so you can turn task lights on only when needed. This preserves the dark period for the pigs while giving workers the light they need.

Step 7: Install and Verify

After installation, use a light meter to verify the actual lux readings. Take measurements at pig eye level in multiple locations across the room. Record the readings and compare them to your target. If some areas are too dark, add fixtures or adjust the aiming. If some areas are excessively bright, you may be able to switch to lower lumen fixtures or adjust the angle.

Photoperiod Management and Control Systems

Setting a photoperiod is only half the job. You also need to maintain it consistently day after day. Manual switching will fail. Someone will forget to turn lights on, or someone will leave them on overnight. The solution is automation.

Timers

A simple 24 hour timer is the cheapest way to control photoperiod. You set the on and off times, and the timer does the rest. Choose a timer rated for the electrical load of your lighting circuit. Some timers can handle only a few hundred watts, while others are rated for 15 amps or more. Match the timer to your load.

Astronomical timers are a step up. They adjust automatically for sunrise and sunset, which is useful if you want the barn lights to follow natural daylight patterns. For a fixed photoperiod, a standard timer works fine.

Photocells

Photocells turn lights on when ambient light drops below a set level. They are useful for barns with windows or open curtains, where natural light contributes to the photoperiod. A photocell can top up the artificial light only when needed, saving electricity.

The drawback is that photocells respond to light, not to time. If a storm darkens the sky at noon, the lights will come on. This is usually harmless, but it can confuse the photoperiod if it happens frequently. For most operations, a timer is more predictable.

Programmable Controllers

If you have a computerized barn controller for ventilation or feeding, check whether it can also control lighting. Many controllers have auxiliary outputs that can switch lights on a schedule. This centralizes control and allows you to adjust the photoperiod from a single interface.

Some controllers also support dimming. You can set a gradual dawn and dusk transition over 15 to 30 minutes. This mimics natural light changes and reduces startle responses in pigs. It also gives workers a visual cue that the day period is ending.

Red Light for Night Checks

If you need to check pigs during the dark period, use red light instead of white light. Red light does not disrupt the pig's sleep cycle as much as white light. Install a few red LED fixtures on a separate circuit. Keep the intensity low, just enough to see movement and check for obvious problems.

Remember that pigs see red less well than humans do. You may need more red light than you expect. Test the red lighting during a normal day to confirm you can see well enough to do a basic check. For detailed veterinary work, use white task lighting only for the duration of the procedure, then return to darkness.

Lighting and Pig Behavior

Pigs are creatures of habit. They respond to predictable routines. A consistent light-dark cycle is part of that routine. When the photoperiod is erratic, pigs show more stress behaviors.

Activity Patterns

Pigs are naturally active during the day and rest at night. When you provide a 14 to 16 hour photoperiod, sows distribute their activity across the light period. They eat, explore, and interact during the day, then settle down to rest at night. This pattern is healthy and matches their natural biology.

When lights stay on 24 hours, pigs lose this rhythm. They may become restless and show more aggression. They may also urinate and defecate more randomly, which makes pen cleaning harder. Restoring a dark period usually resolves these problems within a few days.

Startle Response

Sudden light changes startle pigs. A barn that goes from pitch black to full brightness in an instant can cause pigs to bolt, which leads to injuries and crushing in farrowing crates. A gradual transition, even over 10 to 15 minutes, reduces this problem.

If you cannot install dimmers, you can still reduce startle by using a two-stage lighting scheme. Turn on half the lights first, then the rest 10 minutes later. This gives pigs time to adjust. The same applies at lights out. Turn off half, wait, then turn off the rest.

Feeding Behavior

Pigs learn to associate light with feeding time. If you turn lights on at the same time you deliver feed, the pigs will anticipate the meal. This synchronizes feeding behavior and reduces competition at the feeder. It also makes it easier to observe which pigs are not coming up to eat, which is an early sign of illness.

For lactating sows, a consistent photoperiod helps maintain milk production. Sows that receive 14 to 16 hours of light produce more milk than sows on shorter photoperiods. The piglets benefit from better weight gain and lower mortality.

Common Lighting Mistakes and How to Avoid Them

Even well intentioned producers make lighting mistakes. Here are the most common problems and their solutions.

Mistake 1: Relying on Eye Judgment

The most common mistake is assuming the barn is bright enough because it looks bright. Human eyes adapt to light levels quickly. A barn that seems fine to you may be far below the recommended lux for pigs. Always measure with a light meter.

Mistake 2: Lighting the Alleys, Not the Pens

Many barns have bright alleys and dark pens. Workers walk in the alleys, so the light feels adequate. But pigs live in the pens. If the pens are dark, the pigs are not getting the photoperiod you intend. Aim fixtures to cover the full pen area.

Mistake 3: Inconsistent Photoperiod

Manual switching leads to inconsistent photoperiods. Some days the lights come on at 6 AM, some days at 7:30 AM. Some nights they stay on until midnight. This inconsistency confuses the pigs and reduces the reproductive benefits of the long-day schedule. Use timers.

Mistake 4: No Dark Period

Some producers leave lights on 24 hours because they worry about checking pigs at night. This is a mistake. The dark period is essential for pig rest and reproductive function. Install red night lights on a separate circuit so you can check pigs without disrupting the photoperiod.

Mistake 5: Wrong Color Temperature

Very warm light, below 3000K, appears yellow and can make it hard to assess pig health. Very cool light, above 6500K, appears blue and can be harsh. Stick to 4000K to 5000K for general barn lighting.

Mistake 6: Ignoring Fixture Maintenance

Dust and dirt accumulate on fixtures and reduce light output. A fixture that produced 150 lux when new may produce only 80 lux after a year without cleaning. Wipe fixtures during routine barn cleaning. Replace failing tubes or diodes promptly.

Mistake 7: Using Household Fixtures

Household fixtures are not built for the barn environment. They corrode in the humidity, fail in the dust, and break under pressure washing. Use agricultural grade fixtures with appropriate IP ratings and corrosion resistant housings.

Mistake 8: Skipping the Light Meter Check

You cannot verify your lighting without measuring. A light meter costs less than one replacement fixture. Buy one and use it at least quarterly. Record the readings so you can track degradation over time.

Energy Efficiency and Cost Considerations

Lighting is a recurring cost in swine barns. The exact cost depends on your electricity rate, the number of fixtures, and the hours of operation. You can estimate your cost with a simple formula.

First, calculate the total wattage of your lighting circuit. Multiply the wattage of each fixture by the number of fixtures. For example, 20 fixtures at 100 watts each equals 2,000 watts, or 2 kilowatts.

Next, multiply the kilowatts by the hours of operation per day. If the lights run 16 hours per day, that is 2 kilowatts times 16 hours, which equals 32 kilowatt-hours per day.

Finally, multiply the daily kilowatt-hours by your electricity rate. At $0.12 per kilowatt-hour, the daily cost is $3.84. Over a year, that is about $1,400.

Switching from fluorescent to LED can cut this cost by 50 to 70 percent. If you are replacing 20 fluorescent fixtures that draw 150 watts each, your total load is 3,000 watts. LED replacements that produce the same light draw only about 60 to 80 watts each, cutting the load to 1,200 to 1,600 watts. The annual savings can be significant, especially in barns that run 16 hours per day.

LED fixtures also reduce maintenance labor. A fluorescent tube might need replacement every 18 months. An LED fixture can run 5 to 10 years before replacement. The labor savings from fewer ladder trips and fewer disposal runs add up.

When comparing fixture prices, look at the total cost of ownership, not just the purchase price. A cheap fixture that fails in 2 years costs more than a quality fixture that runs for 10 years. Check the warranty and the rated lifespan. Look for fixtures with a UL or ETL listing, which indicates they have been tested for safety.

Monitoring and Recordkeeping

Lighting management is not a set-and-forget task. It requires regular monitoring and written records. Good records help you identify problems before they affect performance.

Monthly Checks

Once a month, walk the barn and visually inspect all fixtures. Look for flickering, dimming, or dead fixtures. Check for dust buildup on lenses and reflectors. Look for signs of moisture ingress, such as condensation inside the fixture or corrosion on the housing.

Quarterly Light Meter Readings

Every 3 months, take light meter readings at designated points in each room. Mark these points on a floor plan so you measure the same locations each time. Record the readings in a logbook or spreadsheet. Compare the readings to your target and to previous readings.

If readings have dropped more than 20 percent from the previous quarter, investigate the cause. Clean the fixtures and check for failing components. Replace any fixture that cannot meet the target after cleaning.

Photoperiod Log

Record the on and off times for each room. If you use timers, check that they are set correctly after power outages or time changes. A power outage can reset a timer to the wrong time, which will disrupt the photoperiod until you notice.

Performance Correlation

Track reproductive performance alongside your lighting records. If conception rates drop or wean-to-estrus intervals lengthen, check whether the photoperiod has been consistent. A timer failure that left lights on 24 hours for a week can disrupt the sows for several weeks afterward.

The same applies to grow-finish performance. If average daily gain drops or behavioral problems increase, check the lighting schedule. A dark period that is too short or too bright can contribute to the problem.

When to Call a Veterinarian or Extension Agent

Lighting is not a veterinary issue in most cases, but there are situations where professional help is warranted. If you have maintained a correct photoperiod and light intensity, yet reproductive performance remains poor, consult your veterinarian. They can investigate other factors such as nutrition, disease, and genetics.

If you see a sudden increase in aggression or injury in grow-finish pigs, and you have ruled out lighting problems, ask your veterinarian to check for underlying health issues. Pain and illness can make pigs more irritable, and the behavior may not be related to lighting at all.

Your local extension agent can help with lighting design and energy efficiency. Many extension services offer free or low cost energy audits for agricultural operations. They can also help you calculate the payback period for an LED retrofit and identify rebate programs from your utility company.

If you are building a new barn or doing a major remodel, consider consulting an agricultural engineer who specializes in livestock facilities. They can design a lighting layout that meets your needs and avoids the common mistakes listed above. The cost of a consultation is small compared to the cost of a poorly lit barn.

Frequently Asked Questions

How many lux do pigs need in a farrowing room?

Farrowing rooms should provide about 100 lux at the sow's eye level. This is enough for workers to observe the sow and piglets clearly without being so bright that it disturbs the animals. The photoperiod should match the gestation barn at 14 to 16 hours of light per day.

Can I use regular household LED bulbs in my pig barn?

Household LED bulbs are not recommended for swine barns. They are not sealed against dust and moisture, so they fail quickly in the humid, dusty barn environment. They also may not have the proper housing to protect against pressure washing. Use agricultural grade fixtures with an IP65 or higher rating for washdown areas.

Does light color matter for pigs?

Pigs have dichromatic vision, meaning they see blues and greens well but have limited red perception. For general barn lighting, a color temperature of 4000K to 5000K works well. This appears bright and clean to workers and provides adequate light for pigs. Red light can be used for night checks because it is less disruptive to the pig's sleep cycle, though pigs perceive it as dimmer than humans do.

How long should grow-finish lights stay on?

Grow-finish pigs need 8 to 12 hours of light per day. There is no growth benefit to longer photoperiods, and continuous light can increase stress and aggression. Provide a solid dark period of at least 12 hours so the pigs can rest.

What is the best way to control barn lighting automatically?

A simple 24 hour timer is the most cost effective way to control photoperiod. For more control, use a programmable controller that can also manage ventilation and feeding. Some controllers support dimming for gradual dawn and dusk transitions. Avoid manual switching, which leads to inconsistent photoperiods.

How often should I clean my barn light fixtures?

Clean fixtures at least quarterly, and more often if your barn is dusty or you use feed that creates a lot of airborne particles. Dust buildup can reduce light output by 20 to 30 percent. Wipe lenses and reflectors with a dry cloth or use a damp cloth with a mild detergent. Do not use pressure washers directly on fixtures unless they are rated for it.

Do LED fixtures really save money in a swine barn?

Yes. LEDs use 50 to 70 percent less electricity than fluorescent tubes and last much longer. In a barn running 16 hours per day, the energy savings alone can pay for the fixtures within 2 to 3 years. The reduced maintenance labor adds to the savings.

What should I do if my sows are not cycling normally?

First, verify that your lighting is correct. Measure the light intensity at sow eye level and confirm the photoperiod is 14 to 16 hours with a solid dark period. Check that timers are working and have not been reset by a power outage. If lighting is correct and sows still are not cycling, contact your veterinarian to investigate other causes such as nutrition, disease, or body condition.

Related Farming Guides

This section will be populated with links to other farming guides on this site. Check back for related topics on swine housing, ventilation, nutrition, and herd health management.

Related Clinical & Scientific Guides

• Pig Enrichment Programs and Behavior Monitoring
• Swine Handling Facility Design for Safe Pig Movement
• Swine Feeding Management for Grow-Finish Pigs

References

• National Pork Board: https://www.pork.org/
• USDA APHIS Swine Health: https://www.aphis.usda.gov/livestock-poultry-disease/swine
• FAO Pig Production: https://www.fao.org/pig-production-and-products/en/
• FAO Animal Production and Health: https://www.fao.org/animal-production/en/
• WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.