When reading and working at close distances, 100 to 1000 lux of illumination is required for eyes and fatigue. Mirror lighting or bright sunlight can provide 50,000 lux of light, while twilight or dark light only provides 10 lux. It is better to read or work under a fluorescent lamp, because its flux is 4400 lumens compared to the 1600 lumens of a tungsten lamp. If the eyes are exposed in a darker environment for several hours, dark adaptation will be formed and the eyes will feel severely fatigued.
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