Dimmable metal halide lamp and lighting method

Details Dimmable metal halide lamp and lighting method Dimmable metal halide lamp and lighting method

2006-11-21

2006-11-21

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S637000, C313S638000

Reexamination Certificate

active

07138766

ABSTRACT:
A metal halide lamp in which an arc tube is housed within a bulb having a base at one end thereof. The arc tube includes a main tube, two thin tubes that extend one from each end of the main tube, and a pair of electrode inductors. The main tube and the thin tubes are made from translucent polycrystalline alumina and constitute a discharge vessel having a discharge space therein. Lamp power under dimming conditions is set in a range defined by maximum lamp power Wmax [W] and minimum lamp power Wmin [W], with a surface area S [cm2] of the inner surface of the discharge vessel satisfying Wmax/60≦S≦Wmin/20.

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