A
cathode-
ray ultraviolet light source comprising: an elongated glass envelope having a first end and second end, the glass envelope defining an evacuated volume; an
electron gun positioned within the evacuated volume
proximate to the first end and being capable of developing an
electron beam; a target disposed within the evacuated volume between the first and second end of the glass envelope, the target comprising a
phosphor material covered with a reflective
metal film; and an
electron beam focusing and deflecting mechanism disposed within the evacuated volume between the
electron gun and the target to direct the electron beam towards the reflective
metal film of the target.