How UVC Sterilization Works
According to their biological effect, ultra-violet rays can be grouped into 4 bands based on their wavelength.
A-Band (UV-A): Known as Black Spot Effect, contributes to skin tanning
B-Band (UV-B): Known as Erythryma Effect, can cause sunburn
C-Band (UV-C): Known as sterilization ultraviolet (280 – 200nm)
V-Band (V-UV): Known as vacuum ultraviolet, used in scientific equipment
Out of these 4 bands, 254nm UV-C band has the strongest sterilization effect on germs, bacteria and viruses.
It does this by destroying the DNA and RNA of these microbial cells and particles causing them to die without being able to spread and reproduce.