Light valve


A light valve or light vane is a device controlling the light output of a motion picture printer. Three light valves are used in an additive printer head to control the colour quality.

In sound, a light valve is a device that produces a variable width light beam in response to electrical sound signal in a sound camera. 1


1 Case, D., 1985, Motion Picture Film Processing, Media Manuals, Focal Press, London, Boston