Are LED Lights Causing Your Migraines?

Homeowners and businesses are increasingly choosing LED lighting over incandescent and fluorescent bulbs. They’ve been touted as the superior choice with superior energy efficiency and longevity. However, some features of LED light can aggravate symptoms in people who are sensitive to light. One is temporal light modulation, which means the light output changes over time and is often called flicker. Glare, brightness, and light color can also matter. LED light may contribute to headaches or migraine symptoms for some people. It is not a trigger for everyone, and a reaction to light does not establish a diagnosis.

LED lights can contribute to headaches or migraine symptoms for some people, especially when a driver or dimmer creates strong flicker. In a 2024 PNNL lab study, 41% of participants with migraine reported a headache after the session. That compares with 8% of participants without migraine. The eye-movement task was demanding, so the study does not prove that flicker alone caused those headaches.

The main takeaway is that flicker and glare need different fixes. A compatible driver, dimmer, bulb, or ballast addresses flicker at the source. Diffusion and light filters can soften glare and harsh light from a visible point. They do not remove flicker. For a symptom overview, workplace options, and glare-control products, see our guide to LED light headaches.

This article is for general educational purposes and is not medical advice. Seek clinical guidance for new, severe, or changing headaches or migraine symptoms.

What is LED Lighting and Why is It So Prevalent?

LED stands for “light emitting diodes,” an electrical advance popular for its superior energy efficiency compared to incandescent and fluorescent bulbs. LED bulbs currently maintain half of the market space in the lighting industry because they only use 20% of the energy their incandescent counterparts need to perform the same function. They are also cheap to manufacture and purchase, offering energy and cost savings, at least at face value.

While our eyes perceive LED light as white, it’s a mixture of blue, green, red, or amber light converted to white. The “whiteness” of the bulb is determined by the amount of blue wavelengths it contains. This same “blue light” you’ve probably heard referenced in relation to digital device usage can affect comfort, alertness, and sleep timing. Brightness, timing, and length of exposure all matter. These effects are separate from flicker. They do not mean that ordinary indoor LED exposure damages the retina.

LED Lights Aim to Protect Nature, But the Effect is Unnatural

The main takeaway is that not all LEDs produce the same light. According to the Department of Energy, LEDs can reduce energy use and utility costs. Light quality still depends on the source, driver, dimmer, brightness, color, and fixture design. A French health-agency review examined possible effects of LED lighting on people and the environment. Its findings about possible hazards do not prove that ordinary indoor LEDs cause migraine or retinal injury.

The amount of blue light in LED and fluorescent lighting can matter for alertness, sleep timing, glare, and light sensitivity. Blue light has shorter wavelengths and more energy than longer-wavelength visible light. A healthy amount during the day supports normal alertness and sleep timing. Bright or poorly timed exposure may be uncomfortable or disruptive for some people. These color effects are separate from flicker.

Color alone does not tell you whether a lamp flickers. Red, warm-white, and cool-white LEDs can use different drivers and dimming methods. When checking for flicker, the electrical design matters more than the color label.

Some LED systems flicker because their drivers vary the electrical current over time. Pulse-width modulation, or PWM, dims an LED by switching it fully on and off very quickly.

Other drivers use constant-current dimming, which lowers the current instead of rapidly switching the light on and off and can keep the output steadier. An incompatible dimmer can also create stronger flicker.

Fluorescent systems may flicker too, but the speed and size of the change depend on the ballast. Test flicker at the bulb, driver, dimmer, ballast, or fixture. A passive diffuser or filter does not change the electrical signal that powers the light.

Overall, light color, brightness, glare, and flicker are separate features that may affect comfort. If symptoms change by fixture, room, or dimming level, inspect each feature. Do not assume that every LED produces the same effect.

What Did the 2024 PNNL Study Find?

Study design

Researchers at Pacific Northwest National Laboratory studied whether people could see and tolerate flicker from a warm-white LED source. Miller, Irvin, Royer, and Strachan published the work in Lighting Research & Technology in 2024.

Funding came from the U.S. Department of Energy Lighting R&D Program. The study included 55 adults ages 22 to 81: 25 had migraine and 30 did not. Forty-seven participants completed a later symptom questionnaire.

Temporal light modulation and the phantom array effect

Flicker means that light output changes over time. A slow or large change may be easy to see. A faster change may look steady when you stare at the light. During a quick eye movement, however, one light may appear as a row of dots or dashes. Researchers call this the phantom array effect, which is the row of repeated images that a flickering light can create during eye movement.

How the effect looks depends on more than how fast the light changes. Modulation depth is the size of the change between the light’s highest and lowest output. We will call it flicker depth. Duty cycle is the share of each PWM cycle when the light stays on. We will call it on-time. Driver design, dimmer compatibility, brightness, and eye or object movement can all change what a person sees. The PNNL study found that participants with migraine had 3.31 times the odds of seeing the phantom array compared with participants without migraine. This link does not mean that seeing the effect causes a migraine attack.

Results in this study sample

This was a small lab sample. Participants viewed 85 patterns of changing light and completed visually demanding tasks during sessions lasting about 60 to 120 minutes.

• Adverse reactions within four hours: 64% of respondents with migraine and 19% of respondents without migraine.
• Headaches: 41% of the migraine group and 8% of the non-migraine group.
• Eye fatigue or strain: 36% and 12%, respectively. This difference was not statistically significant at the study’s threshold.

These percentages do not show the risk for everyone with migraine. The researchers also reported that 60% of participants with migraine said they had changed their daily behavior because of flicker. The same was true for 17% of participants without migraine. This self-reported finding adds context about daily life. It does not establish a population rate.

Why frequency matters

The takeaway is that a light can look steady and still create a phantom array during eye movement. Researchers tested one PWM-like pattern with 100% flicker depth and 10% on-time. Participants saw the phantom array at speeds far above the range that usually looks like ordinary flicker. Visibility was 89% at 120 Hz, 91% at 400 Hz, 91% at 800 Hz, 93% at 1,200 Hz, 85% at 2,400 Hz, 73% at 4,800 Hz, and 16% at 10,000 Hz.

At 10,000 Hz, that pattern was not statistically more visible or annoying than the steady direct-current control. The authors described 10 kHz as a reasonable minimum target when PWM is used in settings like the experiment. It is not a universal safety threshold or a medical guarantee. It also does not prove that every slower source will cause symptoms. Facility teams can ask manufacturers for the full pattern, flicker depth, frequency, and IES TM-39 or IEEE 1789 documents. Frequency alone does not tell the full story.

What the study cannot prove

The study did not test a migraine treatment or prove that flicker causes migraine. Its limitations include:

• It measured flicker visibility and annoyance, not whether flicker causes migraine.
• Participants repeatedly swept their eyes across the light for an hour or more, an unusually demanding visual task.
• Headaches were self-reported, and participants with migraine knew that headaches were possible.
• Only 47 of the 55 participants completed the symptom follow-up.

The authors warned that the negative outcomes could not be linked to flicker alone. Forced eye movements and visual effort may explain part of the difference. The study also was not designed to find a frequency or flicker depth that causes headache symptoms. Its practical value is more limited. It shows large differences in flicker visibility and in reports after the session. Those findings support better testing and more careful lighting specifications.

Common Symptoms Caused by LED Lighting

“Blue light has a dark side.” - Harvard Health Publishing

LED lighting can be uncomfortable because of brightness, light color, glare, time of day, or flicker. Harvard Health notes that blue-rich light late in the day can affect the body’s sleep timing. This does not mean blue light is the sole cause of migraine symptoms. It also does not mean that ordinary indoor LEDs damage the retina.

Symptoms to watch

Blue-rich light can improve alertness during the day. Bright or poorly timed light may add to eye strain, sleep problems, or migraine discomfort for some people. Symptoms reported around uncomfortable lighting can include:

• Headaches and migraine symptoms
• Migraine photophobia
• Insomnia or disrupted sleep timing
• Double vision
• Dizziness
• Eye strain
• Visual disturbance
• Melatonin suppression and circadian rhythm disruption from bright or poorly timed light
• Light sensitivity

Bright Light Sensitivity

“The brighter the light, the more discomfort, pain, or aversion you probably feel. The wavelength or color of light also plays a role. Blue-green light causes more photophobia than other colors.” - National Headache Foundation

Research on light and headache disorders shows that people with episodic or chronic migraine can respond differently to light intensity and color. Photophobia, or painful sensitivity to light, is a common migraine symptom. Discomfort may occur even at light levels that do not bother other people. This sensitivity is different from seeing flicker. Still, brightness, color, glare, and flicker can occur together in the same space. Learn more about light sensitivity and photophobia.

LED Lighting Is the Migraine Trigger That’s Hard to Escape

“LED lights trigger migraines for some people, because they don’t emit a steady stream of light.” - Migraineagain.com

If you’re experiencing migraine episodes, you might be frustrated by trying to identify the cause. While you might have considered everything from your glasses prescription to your caffeine intake or seasonal allergies, lighting is one environmental factor worth evaluating with other possible triggers.

LED lighting doesn’t just stream from the bulbs in your fixtures. It’s now routinely used in computer monitors, television screens, phones, tablet computers, and even LED holiday lights. Essentially, it’s all around you. If headaches or migraine symptoms repeatedly change with a particular room, screen, fixture, or dimming level, record the pattern and discuss it with a clinician. Lighting may aggravate symptoms for some people, but it should not be assumed to replace a medical evaluation or explain every attack.

LED Light Is All Around Us:

• TV Screens
• Computers
• Tablets
• Smartphones
• Holiday Lights
• Car Lights
• Overhead and Tabletop Lighting
• Store Lighting

Some Populations Are at Particular Risk

Sensitivity to light and flicker varies. People with migraine or frequent headaches may be more likely to report light sensitivity or notice a phantom array. A history of head injury, traumatic brain injury, night-shift sleep problems, or chronic pain may make symptom patterns more complex. Migraine patterns can also change during pregnancy or adolescence. Do not assume that lighting is the cause. Discuss new, severe, or changing symptoms with a qualified clinician.

Lighting factors worth checking

Factors that may justify a closer look at the lighting environment include:

• History of head injury
• History of Traumatic Brain Injury (TBI)
• Working night shifts
• Pregnancy
• Adolescence
• History of migraines or frequent headache pain
• Chronic pain

How Can You Tell Whether an LED Light Is Flickering?

A practical testing sequence

Symptoms alone cannot show that a light has an electrical flicker problem. Start by checking whether discomfort changes by fixture, room, or dimming level. Note the fixture location, lamp or panel type, brightness setting, time of day, and how quickly symptoms change. This record can guide a facility professional to the right equipment. It can also give a clinician better context.

Test the fixture at full brightness and at each dimming level used in normal operation. A problem that appears only when the light is dimmed may point to PWM or a mismatch between the driver and dimmer. If several identical fixtures behave differently, a lamp, driver, ballast, or connection may be failing.

A phone’s slow-motion camera may show rolling bands or pulsing, but this is only a rough test. The camera or phone display can create false patterns. It can also miss flicker that a meter would detect. A pencil-wave test or a quick eye movement across a point of light may reveal several images or a phantom array. Not seeing one does not prove that the light has low flicker.

For a workplace, school, or purchase, ask the manufacturer or facility team how the light is dimmed. Also ask for driver and dimmer compatibility, flicker depth, frequency, and any IES TM-39 or IEEE 1789 documents. A qualified lighting professional can use a flicker meter to compare the light at full, medium, and low brightness.

Use a source-first response if testing finds a problem:

1. Replace a failing or poor-quality bulb, driver, or ballast.
2. Match LED lamps and drivers with a compatible dimmer.
3. Prefer well-documented, low-flicker equipment or constant-current dimming when appropriate.
4. If PWM is used, ask for the complete waveform and frequency. Treat 10 kHz as a study-specific procurement target, not a medical threshold.
5. Test a proposed fixture at low, medium, and full output before a broad retrofit.

Glare needs a separate test and fix. Indirect light, fixture placement, lower contrast, task lighting, and diffusion can soften harsh light from a visible point. These changes may improve visual comfort. They do not repair the electrical source of flicker.

How to Combat LED Lighting’s Impact on Migraines

LED lighting can aggravate migraine symptoms for some people, but other types of light are not always better. Fluorescent lights can also have flicker, glare, and brightness problems. Older fluorescent systems with magnetic ballasts commonly flicker at 100 or 120 Hz. Electronic ballasts generally work at much higher frequencies. For more detail, see why fluorescent lights can cause headaches and our guide to fluorescent light headaches.

Separate flicker from glare

Since LED and fluorescent lighting surround us, start by identifying the characteristic that needs attention. Repair electrical flicker through the bulb, driver, dimmer, ballast, or fixture. Address glare separately with indirect light, task lighting, fixture placement, lower contrast, or diffusion. No single lighting change prevents or treats migraine.

Blue-light glasses are one such solution but aren’t always practical or effective. Alternatively, for those who already wear glasses, there are blue-light coating options you can opt to include in your lens package to produce the same effect. While they might help you while working in front of a screen, they may not be the best solution for all-day wear. LED light streams around the frames and can still shine from overhead.

Current research has not found clear proof that blue-light-blocking glasses help the visual system. Some companies may make false claims. If glare or harsh light from a visible point is the problem, diffusion may improve comfort. If testing confirms flicker, correct the bulb, driver, dimmer, ballast, or fixture at the source.

How Natural Light Filters Prevent LED-Induced Migraines

What filters can and cannot do

Passive light filters have not been shown to prevent, treat, or cure migraine. NaturaLux filters soften harsh overhead LED or fluorescent light and spread the light more evenly. They address glare, not flicker from a bulb, driver, dimmer, ballast, or fixture.

For glare control, LED light filters for overhead fixtures are designed to soften and redistribute harsh overhead light. The verified benefits below apply to glare and distribution, not flicker. If a fixture flickers, repair or replace the electrical source first, then evaluate glare as a separate issue.

Verified Benefits of NaturaLux Light Filters:

• Reduce overhead glare by up to 90%
• Retain about 80% of useful light in real-world use
• Soften harsh point-source light
• Redistribute light more evenly across the room

5 Tips to Improve LED Light Sensitivity

Since we can’t escape artificial lighting completely, we must reduce its impact however we can. Most of us are exposed to LED lighting through our jobs, homes, commute, or everyday activities. These steps can help you check the space without assuming that every symptom has the same cause.

1. Choose well-documented, low-flicker lighting where possible. Test it at every dimming level you plan to use.
2. If you cannot replace the fixture, correct any electrical flicker at the bulb, driver, dimmer, or ballast. Use diffusion only for a separate glare problem.
3. Take advantage of smartphone brightness, color, and night settings when they improve comfort.
4. Take regular breaks from screens and visually demanding tasks.
5. Reduce bright device exposure near bedtime when it disrupts sleep, and seek clinical guidance for new, severe, or changing symptoms.

How to Protect Employees from LED Health Risks

“For more than 90% of those affected, migraine interferes with education, career or social activities.” - American Migraine Foundation

A workplace response plan

LED lighting remains a common choice because it uses less energy and can cost less to run. Comfort and flicker vary by lamp, driver, dimmer, fixture, brightness, and installation. Facility teams should record which rooms, fixtures, dimming settings, and times are linked to complaints. Each report may have a different cause.

First, check for failing lamps, drivers, dimmers, and older fluorescent fixtures with magnetic ballasts. Test a low-flicker light and a separate glare fix. This helps the team tell which change works. Flexible seating, task lighting, breaks, or areas with less glare may also help as part of an individual workplace plan.

Our Affordable Filters Guard Against Migraines and So Much More!

No passive filter has been shown to prevent migraine. The right action depends on the problem. Fix electrical flicker at the bulb, driver, dimmer, ballast, or fixture. Then use glare control where harsh brightness or uneven light adds to discomfort.

Understand the causes, then choose the right next step. The LED Light Headaches guide covers glare, symptom context, workplace options, and NaturaLux™ product choices. If testing points to electrical flicker, repair the driver, dimmer, bulb, or fixture first. Explore LED light headache causes and glare-control options.

Planning changes across a workplace or school? Start with the fixture, driver, dimmer, and glare conditions so each problem gets the right solution. Request a bulk lighting quote.

About Dr. Molly Duong

Dr. Molly Duong is a therapeutic and glaucoma certified optometrist. She obtained her doctorate degree at the University of California Berkeley, School of Optometry, and graduated with Honors in Research. Upon graduation, she completed a residency at the Major Charles Robert Soltes Jr. Blind Rehabilitation Center located at VA Long Beach, gaining expertise in primary care, low vision, and traumatic brain injury cases.

She is passionate about expanding innovations in technology and medical devices to improve vision care, and is always looking to build her professional acumen. On top of patient care, she also works in medical writing for ophthalmic trade articles and blogs, as well as consulting for a new vision-based web application in development.

Resources and Citations:

1. Miller, N. J., Irvin, L., Royer, M. P., and Strachan, M. E. “Visibility and annoyance of the phantom array effect varies with age and history of migraine.” Lighting Research & Technology (2024). Journal DOI. DOE archival full text.
2. Miller, N. J., et al. “Flicker: A Review of Temporal Light Modulation Stimulus, Responses, and Measures.” Lighting Research & Technology (2023). DOE archival full text.
3. Wilkins, A. J., Nimmo-Smith, I., Slater, A. I., and Bedocs, L. “Fluorescent lighting, headaches and eyestrain.” Lighting Research & Technology (1989). Journal DOI.
4. McAdams, H., et al. “Selective amplification of ipRGC signals accounts for interictal photophobia in migraine.” PNAS (2020). Full text.
5. ANSES. “Effects on human health and the environment of systems using light-emitting diodes.” (2019). Full report.
6. Prevent Blindness. “Blue Light and Your Eyes.”
7. Harvard Health Publishing. “Blue light has a dark side.”
8. PubMed record. “Blue-light filtering spectacle lenses for visual performance.”
9. Migraine Again. “Coping with Eyes Sensitive to Light.”
10. Electronics Hub. “Light Emitting Diode Basics.”
11. Make Great Light. “See the Differences.”
12. Make Great Light. “Fluorescent Light Covers.”
13. Make Great Light. “LED Light Filters.”
14. Make Great Light. “Contact.”
15. Make Great Light. “Homepage.”