The CCFL UV lamps is truly Ultra Violet, it doesnt emit much visible light. It does emit a lot of ultra violet light that you cannot directly see. What little light you do see directly is a very deep purple, UV Lamp works be with UV-reactive or phosphorescent surfaces .

It is a new generation illuminating source focus on paper money testing machine. The ultraviolet wavelength of the tube is 365nm+-5nm.

Ultraviolet radiation is a kind of invisible light whose wavelength range is from 136nm to 400nm, it is divided into three wave bands: A,B,C and vacuum ultraviolet radiation.
A wave band :320nm-400nm
B wave band:275nm-320nm
C wave band:200nm-275nm
Vacuum wave band:100nm-200nm