General Electric Company

Ludwig Skilskyj

Edward J Collins

Laszlo V Lieszkovszky

Leonard E Hoegler

Jacob Brann

A method to eliminate filament hot shock in lamp filaments, particularly in compact filament light sources such as high efficiency infrared reflective coated halogen lamps, during installation or during energization comprising a voltage reduction circuit that reduces the voltage applied to the lamp filaments for a predetermined period of time and a timing circuit that is activated each time the lamp is energized and controls the predetermined period of time during which the voltage reduction circuit reduces voltage applied to the lamp filaments. Optionally, a one time latch circuit may be included that enables the timing circuit upon energization and disables it after the voltage reduction circuit has operated continuously for the predetermined period of time, and forever thereafter.

Reduced voltage and time delay to eliminate filament hot shock

A reflector lamp (,) has a forward parabolic section (,) and a rear concave section (,), which may be parabolic, ellipsoidal, or spherical. A light source (,), such as the filament of a halogen lamp, is axially aligned with the axis of the reflector (LA) and is centered at the focal point of the forward and rear sections. The parabolic forward section is fluted to spread the light reflected therefrom smoothly in a beam of light, minimizing the center hot spot. The rear section, which is not fluted, directs the light reflected therefrom within the desired beam angle, resulting in little wasted light being emitted outside the desired beam angle.

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Concord, OH, United States of America

Ludwig Skilskyj