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What is UV Light and can it kill COVID-19?



Ultraviolet (UV) light is a type of electromagnetic radiation. Natural electromagnetic radiation comes from the sun. Artificial electromagnetic radiation comes from tanning booths, black lights, curing lamps, germicidal lamps, mercury vapor lamps, halogen lights, high-intensity discharge lamps, fluorescent and incandescent sources, and some types of lasers [1].


Either or, electromagnetic radiation it is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic (EM) spectrum. The spectrum is generally divided into multiple regions in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays, and gamma-rays.




UV light falls in the range of the EM spectrum between visible light and X-rays. It has wavelengths of about 380 nanometers (nm) to about 10 nm. UV is generally divided into three sub-bands [2]:


  • UV-A, or near UV (315–400 nm)

  • UV-B, or middle UV (280–315 nm)

  • UV-C, or far UV (180–280 nm)



WHAT ARE THE DIFFERENCES BETWEEN UV-A, UV-B, & UV-C LIGHTS?