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Sunburn effect (as measured by the UV index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. [9] [10] The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface.
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The WHO-standard ultraviolet index is a widely publicized measurement of total strength of UV wavelengths that cause sunburn on human skin, by weighting UV exposure for action spectrum effects at a given time and location. This standard shows that most sunburn happens due to UV at wavelengths near the boundary of the UVA and UVB bands.
4 UV Index. 6:20PM Sunset. 5 mph F 8 km/h C Wind. 64 ... Fact check. There was no tornado in Rogers, Arkansas, on Jan. 29, according to an area meteorologist. Fox Weather 4 hours ago
UV exposure might, for example, affect serotonin levels, which play a significant role in mood regulation and cognitive functions. This hormonal effect can helps stabilize circadian rhythms. This stabilizing effect is particularly important for individuals with mental disorders, who often experience circadian desynchronization and sleep problems.
The following table is listing suggestive relations of the lightfastness ratings on different measure scales and the relation relative to time in direct sunlight and normal conditions of display: away from a window, under indirect sunlight and properly framed behind a UV protective glass. [10]
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