The Mayo Clinic was using infrared light to kill Covid germs two years ago. I have an infrared spa I used after I went to town two years ago. Now it’s big news?
Agreed. Businesses are selling “lights” at certain wavelengths which are highly effective against COVID germs on surfaces. But can’t be had at reasonable prices.
Ultra violet light to kill germs on surfaces has been known for a long time.
Various health benefits of infrared light have also been known.
But this might be the first randomized controlled trial that tested NIR light with covid patients.
The "red light therapy" approach uses infrared, not ultraviolet. High intensity infrared can be effective into the chest cavity. The TLR4 suppression is helpful for those infected with SARS-CoV-2. It also reduces inflammation from other causes. Wavelengths are typically 660 to 850 nm.
My local "Sunsations" business has a stand-up red light booth. 7 kilowatts of red light lasting 12 minutes per session. A vibrating plate functioning through the feet is included to improve circulation. It helps my arthritis when I make time to do it. They charge $80 for 10 sessions. I couldn't build anything as good as I can rent from them at that price.