Tel Avev University found that UV led lights kills covid. My spa is made from IF led lights and cost a couple hundred dollars from Amazon.
Just FYI, “In 1878, Arthur Downes and Thomas P. Blunt published a paper describing the sterilization of bacteria exposed to short-wavelength light. UV has been a known mutagen at the cellular level for over 100 years. The 1903 Nobel Prize for Medicine was awarded to Niels Finsen for his use of UV against lupus vulgaris, tuberculosis of the skin.”