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Ultra violet (UV) radiation is present in sunlight and also produced by specialized lights. Suntan, freckling and sunburn are all familiar effects of over-exposure, along with higher risk of skin cancer. We would be severely damaged by ultraviolet radiation if most of it were not filtered out by the Earth’s atmosphere.

However, its not all bad news as the UV spectrum also has beneficial effects on human health. Ultraviolet is also responsible for the formation of bone-strengthening vitamin D in most land vertebrates, including humans.

UV wearables are few and far between. While there are a number of stand-alone devices, their number pales when compared to the wide range of fitness and activity trackers on the market.

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