Short wave UV (UVC 254nm) has a pronounced bactericidal action. UVA (c.320nm) has a limited effect.
I stand rather corrected, thank you. For some reason I thought UVA was a shorter wavelength...
This bulb is lost in the ozone.
If I need heavy-duty germ obliteration I'll mix up a mercuric chloride solution instead (only used it once!). Kills everything, including the applicator if one isn't careful!!!! Actually, there are plenty safer items around but there was a hantavirus danger so I used HgCl2.
Again, I'm very skeptical of this bulb but I am just expressing my opinions.
