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Ljusmodulationer från LED ljuskällor kan störa flimmerkänsliga människor


  • Robert Backe

Summary, in English

Flickering lights affect human health. This can manifest in a variety of ways, such as epileptic seizures, headaches, eyestrain and impaired visual performance. However, little is known about the health risks of invisible flickering from energy-efficient light emitting diodes (LED). The aim of this study was to investigate the impact of invisible flickering from LED lighting on human health. The eye movements (saccades), brain activity (alpha rhythms) and blood pressure of five female university students (23-28 years old) was recorded while the participants were exposed to invisible flickering from two types of LED light sources for 1h at each conditions. The results showed no apparent effects on saccades, alpha rhythms or blood pressure. However, one of the participants with high critical flicker frequency (CFF) experienced flickering which disrupted her visual reading performance. The findings show that flickering LED lighting may have a negative impact on humans who are highly sensitive to flickering. Further research is needed to explore how invisible flickering affects human health.


  • Studies in Environmental Science

Publishing year




Document type

Student publication for Master's degree (two years)


  • Medicine and Health Sciences
  • Earth and Environmental Sciences


  • flicker
  • LED
  • health
  • human


  • Hillevi Hemphälä
  • Marcus Nyström