Impact of Lighting on Neurodiverse Individuals
Lighting plays a vital role in creating comfortable and supportive environments for all of us but, if you add neurodiversity into the mix, getting it right can be pivotal. Why? Because the neurodiverse brain tends to be even more sensitive to sensory stimuli.
One study, for example, claims that more than half of autistic adolescents have visual processing deficits, including sensitivity to light.1 Other analyses have noted that hypersensitivity to light and photophobia increases with autistic traits as well.2 But this is not limited to autism – it’s also a trait of ADHD, dyslexia, dyspraxia, and many more.
From overstimulation to difficulty concentrating, the wrong lighting can significantly affect well-being. Neurodiversity is an extremely broad term, with many of the diagnoses existing on a scale, so it may seem an overstatement to claim that lighting can help everyone, but let’s break down the science.
Why Lighting Matters
While the neurodiverse spectrum is vast, one common concern among many neurodivergent individuals is heightened sensitivity to sensory stimuli, including light, leading to frustration, anxiety, or difficulty concentrating.
1. Blue Light Sensitivity
Blue light emitted by LEDs and digital screens, is highly stimulating – to everyone, but this response is often exacerbated in the brains and biological systems of those who are more sensitive. Characterized by wavelengths between 400-500nm, its intensity will often feel ‘too much’ since it increases arousal levels (and the production of cortisol) in the brain, making it harder to focus and process information. It can also disrupt sleep patterns by interfering with melatonin production, which is especially problematic for individuals with sensory sensitivities. The greater, or more extensive the exposure, the more heightened the impact is proven to be – thus long hours in poorly lit classrooms or offices can prove highly stressful and tiring. This will frequently result in raised levels of behavioural or neurological symptoms – everything from poor concentration and anxiety to headaches, impulsivity and inability to control mood.
2. Flicker Sensitivity
While flicker from LED lights might be imperceptible to the naked eye, the brain can still pick up on these rapid light fluctuations. For those with ADHD, dyslexia, or other cognitive differences, flickering light can make activities like reading even more challenging. The neuropathways become a battle ground of contradictions as the light/shadow interplay distracts from the words, making reading unnecessarily hard work. There’s a reason the latest European regulations require bulbs to limit their flicker and stroboscopic effects! This subtle, but powerful, form of overstimulation can increase stress and anxiety exponentially.
3. Full-Spectrum Lighting
Sunlight naturally has a full spectrum of wavelengths, which our brains are perfectly adapted to process and even benefit from. The spectral curve measuring the light is always smooth. For neurodiverse individuals, it’s important to replicate this effect indoors by using lighting that mimics the sun’s spectrum, because navigating spikes and troughs in the spectrum requires the brain to work to smooth or bridge those inconsistencies, making it distracting and tiring. Sunlight is not stressful. It does not exaggerate sensory sensitivities. It soothes. Full Spectrum lighting has been shown to help regulate mood, boost concentration, and support circadian rhythms, making it a vital tool for neurodivergent individuals who may have visual processing difficulties.
Signs That Lighting Might Be Affecting Neurodivergent Individuals
Understanding the role of lighting in neurodiversity isn’t just about theory—it’s about recognizing signs that lighting might be contributing to a struggle. Some telltale signs that lighting is affecting neurodivergent children or adults include:
• Fidgeting excessively
• Inability to focus
• Headaches and visual fatigue
• Increased anxiety or mood swings
• Restlessness and impulsivity
• Sensory blocking (e.g. covering eyes)
If you notice these behaviours, it’s worth considering whether external factors like lighting could be contributing to the stress.
Conclusion
Whether at home, school, or work, optimal lighting can help neurodiverse individuals thrive, making it easier to focus, relax or engage with the world and improving not only their productivity but also their overall quality of life.
If you’re a parent, teacher, or employer, consider implementing these lighting solutions to foster a more inclusive, supportive environment. After all, good lighting isn’t just beneficial for neurodivergent individuals—it’s good for everyone.
1.Howe FEJ, Stagg SD. How Sensory Experiences Affect Adolescents with an Autistic Spectrum Condition within the Classroom. Journal of Autism and Developmental Disorders. 2016;46:1656-1668. doi:10.1007/s10803-015-2693-1. 2.Sperandio I, Unwin KL, Landry O, Chouinard PA. Size Constancy is Preserved but Afterimages are Prolonged in Typical Individuals with Higher Degrees of Self-Reported Autistic Traits. Journal of Autism and Developmental Disorders. 2017;47(2):447-459. doi:10.1007/s10803-016-2971-6.
We hope this has helped with a little more understanding of how we respond to light, if you’d like a quick guide for creating neurodivergent-friendly lighting in your home or work place, please just fill in your email address here and we’ll send you 5 key tips from lighting design experts.
