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Views: 0 Author: Site Editor Publish Time: 2024-05-29 Origin: Site
What is ultraviolet light?
Ultraviolet light is light radiation with a wavelength between 180-400nm. According to the wavelength and its effects on the body, ultraviolet light can be divided into three bands: short-wave ultraviolet (UVC, 180-280nm), medium-wave ultraviolet (UVB, 280-320nm), and long-wave ultraviolet (UVA, 320-400nm). The sun is the main source of ultraviolet radiation on the Earth's surface. Among the sunlight reaching the Earth's surface, UVA accounts for about 90%, UVB accounts for less than 10%, and UVC is generally blocked by the atmosphere and rarely reaches the Earth's surface (see Figure 1). Many artificial light sources, such as halogen lamps, high-pressure mercury lamps, fluorescent lamps, excimer lasers, and light-emitting diodes (LEDs), can emit specific wavelengths of ultraviolet light with clinical therapeutic effects.
