I have just checked out Urban Sun. I was unaware about the far UVC in particular being antiviral. With the current pollution being a factor in both absorption of sunlight and corona death, it may be time to consider additional light sources in our overcrowded urban areas. However, I agree with you that we want to keep our eye on a regenerative future. This may mean a melding of human endeavour and nature's healing; either alone may not be successful.