eli5: Why are the sun rays harmful but not rays for artificial lights?
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Light from the sun is a wide spectrum of waves. Some of them are ionizing waves, this means the fotons have enough energy to knock off electrons, and this makes them harmful.
Artificial lights tend to be more specific in the wavelengths that they emit, because they are made by design. Therefore they don’t emit any ultraviolet or ionizing radiation as that light is wasted energy for the purpose of lighting up a room.
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