Q Is UV-C effective against COVID-19?

Yes, it is. Several coronaviruses related to COVID-19 have been found to be susceptible to
UVC energy. A previous study demonstrated that 10 min of UVC light inactivated 99.999% of
previous Coronaviruses, SARS-CoV, and MERS-CoV. Also, some studies, provide more
info specifically for COVID 19 strain here (Ref:
https://msystems.asm.org/content/5/2/e00245-20)