Matsushita Electric Works R & D Laboratories Inc.

Hongyon Gu

Jakob Maya

A discharge lamp adapted to operate on DC current and being equivalent to an AC-operated ceramic metal halide lamp in different operating positions. The lamp comprises a ceramic arc tube with a fill of mercury, rare gas and metal halides. The arc tube is sealed with an anode and a cathode and has at least one metal heat shield on the cathode side of the ceramic DC metal halide arc tube to achieve operation of the lamp with universal orientation. Each of the two electrodes sealed into the arc tube are different, the anode being formed of tungsten with a ball shaped tip and the cathode being formed of a thoriated tungsten rod and a wound coil of the rod.

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Lexington, MA, United States of America

Hongyon Gu