Light and Migraine: What the Science Actually Says

The green light findings

Researchers investigating how different colours of light affected migraine pain during an attack found that every colour increased discomfort for most participants — the brighter the light, the worse the pain. But there was an unexpected finding buried in the results: roughly 20% of participants reported that a narrow bandwidth of green light actually had a therapeutic effect during an active migraine. One of the researchers behind the study, Harvard's Rami Burstein, noted the response was personal — not everyone found green light to be the least painful, but a meaningful portion did find real relief.

A follow-up study from the University of Arizona Health Sciences, involving 29 migraine patients, found that daily exposure to this specific green light for one to two hours reduced headache pain by 60% and cut down how often migraines occurred. That research led to a purpose-built device (the "Allay Lamp") designed to reproduce that exact wavelength.

The circadian angle

A separate, newer line of research looks at bright light therapy — full-spectrum light used to regulate sleep and circadian rhythm — as a possible migraine prevention tool, since sleep disturbance is a well-established migraine trigger. This is still an active area of study, with a major randomised trial currently underway to determine whether stabilising circadian rhythm through light exposure meaningfully reduces migraine frequency. The results aren't in yet, so it's promising rather than proven.

The takeaway

Light therapy for migraine is a real and active area of research — but it's specific. The strongest evidence is for a particular green wavelength delivered at a particular intensity, and the broader bright-light-for-circadian-health research is still being tested. Not all light devices are interchangeable, and nothing here should be read as a substitute for a proper migraine management plan from a doctor or headache specialist.

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General light therapy — including polarised, full-spectrum sessions like Hyperlight Therapy at Quantum Health International — is used to support relaxation, circulation, and overall wellbeing rather than to treat migraine directly. If you experience migraines, it's worth discussing with your GP or neurologist first, and treating light-based wellness sessions as a complement to — not a replacement for — proper migraine care.