Excess light turn-off circuit
Exposure system
External sensor for electronic flash
Fail-off photo control circuit for night lighting
Feedback control system for applying AC power to ballasted lamps
Feedback-controlled LED switching
Ferrite stabilized LED drive
Fiber-optic anti-cycling device for street lamps
Firing apparatus for a plurality of electric valves
Flash apparatus with flash terminating switch controlled by phot
Flash lamp discharge using radiant energy
Flash tube apparatus with delayed emission
Flash unit having plural flashlamps
Flourescent lamp with integral proximity sensor for building...
Fluorescent ballast with inherent end-of-life protection
Fluorescent lamp apparatus with integral dimming control
Fluorescent lamp ballast with light output control
Fluorescent lamp controller and original-document exposing appar
Fluorescent lamp controlling arrangement
Fluorescent light and motion detector with quick plug release an