"Shadow flicker" – when the blades of a turbine cast a shadow over local residents – is a known phenomenon and UK planning law now insists it should be considered during any application. Planning guidelines state that shadow flicker can impact on residents who live within a distance 10 times greater than the blade's diameter.
However, the typical frequency of flicker caused by a large turbine – 1.75Hz, or about 35rpm – is lower than the frequency range – 3-60Hz – that the Epilepsy Society says can affect those who can suffer seizures triggered by photosensitive epilepsy. Shadow flicker is, therefore, considered an environmental "nuisance" rather than medical risk.
See full Article.
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