LED Lights Can Efficiently, Quickly and Cheaply Kill SARS-CoV-2 Virus

They believe that the UV-LED technology will soon be available for private and commercial use.

Researchers from Tel Aviv University (TAU; Tel Aviv, Israel) conducted the first study on the disinfection efficiency of UV-LED irradiation at different wavelengths or frequencies on a virus from the family of coronaviruses. The researchers tested the optimal wavelength for killing the coronavirus and found that a length of 285 nanometers (nm) was almost as efficient in disinfecting the virus as a wavelength of 265 nm, requiring less than half a minute to destroy more than 99.9% of the coronaviruses. This result is significant because the cost of 285 nm LED bulbs is much lower than that of 265 nm bulbs, and the former are also more readily available.

Eventually, as the science develops, the industry will be able to make the necessary adjustments and install the bulbs in robotic systems or air conditioning, vacuum, and water systems, and thereby be able to efficiently disinfect large surfaces and spaces. The researchers believe that the technology will be available for use in the near future and now plan to will test their unique combination of integrated damage mechanisms and more ideas they recently developed on combined efficient direct and indirect damage to bacteria and viruses on different surfaces, air, and water.

"We discovered that it is quite simple to kill the coronavirus using LED bulbs that radiate ultraviolet light," said Professor Hadas Mamane, Head of the Environmental Engineering Program at TAU's School of Mechnical Engineering, Iby and Aladar Fleischman Faculty of Engineering. "We killed the viruses using cheaper and more readily available LED bulbs, which consume little energy and do not contain mercury like regular bulbs. Our research has commercial and societal implications, given the possibility of using such LED bulbs in all areas of our lives, safely and quickly."

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Tel Aviv University