LIGHTING FIXTURE Russian patent published in 1995 - IPC

FIELD: lighting engineering. SUBSTANCE: controlled key connected in parallel to principal integrating capacitor which ensures smoothness of switching on of filament lamp is manufactured in the form of unijunction transistor with integrator in control circuit. It enables operational capability of lighting fixture to be restored quickly after its switching off. After switching off of fixture its repeat turning on in tenth fraction of second provides for smooth switching on of filament lamp which makes it possible to exclude completely sudden switching on of lamp to rated brightness and to prolong its service life by this. EFFECT: prolonged service life of filament lamps. 1 dwg