Ultraviolet (UV) light has shorter wavelengths and more energy than visible light. UV constitutes a fairly wide range of the electromagnetic spectrum, with waves ranging in size from 40 to 400 nanometers (nm). You can use the energetic nature of UV light in many beneficial ways, including art, forensic science and medical hygiene.
Vitamin D
Scientists call UV light in the range of 290 to 320 nm UVB. Your skin needs UVB to produce vitamin D, which your body needs for strong bones, immune system and blood. Five to 15 minutes of summertime sun a few days a week gives you enough UVB to maintain healthy levels of vitamin D.
Lighting
Efficient fluorescent lighting takes advantage of the fluorescence caused by ultraviolet light. Mercury vapor inside the fluorescent lamp gives off strong UV when an electric current flows through it. The UV makes a phosphor coating inside the glass glow with white light.
Germicide
UVC, the range of ultraviolet light between 220 and 290 nm, kills germs. Hospitals and clinics use special light bulbs that produce UVC to disinfect the air and work surfaces. You can have a UVC germicidal lamp installed in your home heating system to kill airborne germs. The ultraviolet light will kill bacteria, viruses and mold wherever the light reaches.
Art
Black light posters take advantage of the bright fluorescent colors given off by certain paints. A black light gives off UVA in the range of 320 to 400 nm. When the fluorescent paint absorbs UVA, it absorbs the invisible light energy and glows with visible light of its own, producing dramatic visual effects.
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