Ultraviolet is a term used to describe the wavelengths between the blue violet range of the visible spectrum and the shorter wavelength or X-rays. The ultraviolet spectrum is divided into three separate bands:-

U.V.a From 100nm to 280nm
U.V.b From 280nm to 315nm
U.V.c From 315nm to 400nm

U.V.c is often referred to as germicidal wavelength, because of its ability to destroy micro-organisms. The tubes in all of our U.V. sterilisers emit a ...