Welch Allyn, Inc.

John W Harkins

Robert J Wood

Dean A Bell

Lorand Ernyey

A hand-held flashlight comprising a metal halide arc lamp operating between 8 and 22 watts. The lamp has an arc gap of between 0.7 and 1.4 mm and a color temperature at or above 5000&#xb0; Kelvin. The lamp contains a fill gas including mercury and indium in percentages to produce a point source of white light capable of penetrating dense smoke and fog. The flashlight includes a reflector containing the arc lamp and providing a collimated beam of high intensity white light. The flashlight includes a circuit for providing a high starting voltage to the lamp and a lower operating voltage after sustaining the lamp. The circuit includes a battery, a ballast, and a microprocessor for monitoring the lamp and the battery. The microprocessor provides a discernible output signal indicative of the lamp on-time and battery voltage. The microprocessor controls the application of the starting voltage from the ballast to the lamp to prevent misstarting of the lamp.

Flashlight equipped with low wattage arc lamp

A low wattage sub-miniature, tungsten-halogen lamp having high efficacy and long life. The lamp has a cylindrical envelope in the T-1 to T-11/4 range containing a fill gas having a halogen minor constituent and an inert gas major constituent. The lamp operates at high fill gas pressures, and lower halogen gas content.

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Baldinsville, NY, United States of America

John W Harkins