How Blue Light Technology is Helping Horses with Seasonal Headshaking

Bay horse shaking head - with text: "Managing Seasonal Headshaking with Blue Light"

Seasonal headshaking can be one of the most frustrating and distressing conditions for horse owners. Symptoms often appear suddenly, worsen quickly, and disappear just as mysteriously — usually tied to changes in the time of year.

While the exact cause of Seasonal Headshaking Syndrome is still being studied, growing research suggests that changes in daylength play an important role. That’s why the Equilume blue light technology is gaining attention as a promising, non-invasive way to help manage symptoms.

Delivered through an Equilume Light Mask or our specialised Stable Light system, blue light therapy helps stabilise the horse’s internal response to seasonal daylight changes — reducing triggers believed to worsen headshaking.

 

Why Seasonal Light Changes Can Trigger Headshaking

A large proportion of seasonal headshaking cases are believed to be linked to rapid changes in daylength, particularly around spring and summer.

As daylight increases, nerve signals from the brain activate seasonal hormones. In some horses, this process may also overstimulate the trigeminal facial nerve, leading to nerve pain and headshaking symptoms.

Chestnut Horse Shaking His Head

Example of Headshaking

Common signs of headshaking include:

  • Repetitive head tossing
  • Vertical head movement or “ticcing”
  • Nose rubbing
  • Sneezing or snorting
  • Eye sensitivity
  • Irritability during exercise

Most owners report that headshaking symptoms worsen during spring and summer, and improve as daylight shortens.

 

How Blue Light Helps Reduce Seasonal Triggers

Horses are highly responsive to blue wavelengths of light, especially in the 468–480 nm range. When exposed to 15 hours of blue light per day (like with the Equilume Pro Light Mask),  the brain receives a consistent “long-day” signal — similar to a stable summer daylength.

Close up image of the Equilume Light Mask cup, showing the inside of the cup and a front on shot of the horses head. The blue light from the light mask cup creates a blue glow on the horses eye.

Equilume Light Mask

This “long-day” signal helps regulate the horse’s circannual clock and may reduce the hormonal and neurological fluctuations that aggravate headshaking.

Key benefits of blue light therapy include:

  • Stabilisation of seasonal hormone signals
  • Reduction of sudden daylength changes the brain reacts to
  • Support for a calmer nervous response
  • Improved overall comfort and quality of life

The goal is to smooth out seasonal spikes, rather than allowing abrupt changes.

 

Research Spotlight: Blue Light and Seasonal Headshaking

A new research study evaluated the effects of blue light masks on horses diagnosed with seasonal headshaking in Australia. Horses wore an Equilume Pro Light Mask fitted at the autumn equinox, receiving 15 hours of blue light daily from 8:00a.m. to 11:00p.m.

 

How the study worked:

  • 17 horses participated
  • Each horse served as its own control
  • Light Masks were fitted at the autumn equinox
  • Horses received 15 hours of blue light daily
  • Owners scored six clinical signs on a 0–4 scale
  • Data was collected before, during, and after treatment

 

What the results showed:

Among horses with complete data:

  • 7 out of 10 showed improvements
  • 2 horses experienced complete resolution of symptoms
  • Overall symptom intensity decreased over time
  • Owners reported improved quality of life
  • Symptoms tended to stabilise once long-day lighting was maintained

While not every individual symptom reached statistical significance, five out of six clinical signs improved, and the overall trend was clearly positive.

 

What This Means for Horse Owners

By maintaining a consistent “summer light” signal, blue light therapy with the Equilume Pro Light Mask or Equilume Stable Light helps reduce the seasonal triggers believed to aggravate facial nerve sensitivity.

Many horses become more comfortable, and some experience dramatic improvement during the treatment period. Individual variation is expected, but positive outcomes are common.

 

Best-practice recommendations from researchers include:

  • Start blue light therapy mid- to late summer
  • Maintaining long-day lighting through winter

 

Women riding horse.

Olivia and Tux competing

 

“The Equilume mask completely resolved my horse’s headshaking. It was truly life-changing.”

— Olivia McDermott, owner of Tux

 

 

 

Equilume Pro Light Mask

Owners using the Equilume Pro Light Mask for headshaking frequently report:

  • Reduced or eliminated headshaking
  • Calmer behaviour during exercise
  • Improved rideability
  • Better overall quality of life

Because the Equilume Pro Light Mask is automated and wearable, horses receive consistent, targeted blue light without changes to turnout schedules or barn lighting.

 

Is Blue Light Right for Your Horse?

Consider Equilume blue light if your horse:

  • Shows seasonal headshaking symptoms
  • Becomes uncomfortable as daylength increases
  • Reacts strongly during spring and summer
  • Needs a non-invasive, research-backed management option

Your horse’s body responds to light. For some horses prone to headshaking, seasonal changes are too intense, and symptoms can appear. By working with your horse’s natural biology, blue light therapy offers a practical way to reduce seasonal triggers and support comfort year-round.

 

 

Help manage seasonal headshaking using the Equilume Pro Light Mask.

Access the full scientific papers on our Research page.
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