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As explained by my headache specialist: Fluorescent lights can contribute to migraine attacks because people with migraine disease are sensitive to the lights, which flicker hundreds of times a second. This is noticeable to people with migraine because of the hypersensitivity of their brains, which cannot filter out unnecessary stimuli like sounds and lights, whereas other people's brains tell them they don't need to worry about it so they don't even notice.

P.S. What is doubly worse is in the UK and Europe where lighting flickers at 50Hz but Computer Monitors, due to being made to US and Japanese standards, typically flicker at 60Hz unless specifically switched to another frequency (usually 50Hz isn't offered but 75Hz is). This causes something called a "beat frequency", like the equivalent of putting two sheets of net curtaining next to each other, and seeing a gingham check patterning caused by the dark and light patches meshing together against each other.

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