Metal halide lamp and luminaire

Details Metal halide lamp and luminaire Metal halide lamp and luminaire

2008-03-25

2008-03-25

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S025000, C313S620000, C313S572000, C313S573000

Reexamination Certificate

active

10582844

ABSTRACT:
he present invention aims at providing a metal halide lamp having a configuration to achieve the following goals: to prevent the lamp from burning out during the life due to a rise in lamp voltage; and to obtain high luminous efficiency at the same time. The metal halide lamp1comprises: an arc tube4made of translucent ceramic and having a main tube part6in which a pair of electrodes14is disposed; and an outer tube3housing the arc tube4therein. 4.0≦L/D≦10.0, where L (mm) is a length of a space between the electrodes14and D (mm) is an internal diameter of the main tube part6. R/r ≧3.4, where R (mm) is an internal diameter of the outer tube3and r (mm) is an external diameter in the main tube part6of the arc tube4, within a region positionally corresponding to, in a radial direction of the outer tube and the arc tube, the space between the electrodes14, on a cross-sectional surface where an outer circumference of the arc tube4comes closest to an inner circumference of the outer tube3. M≦4.0, where M (mg/cc) is a density of mercury enclosed in the arc tube4.

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