| 摘要 |
The invention is directed to a lighting device, particularly a high-pressure metal halide lamp, wherein a material combination of the body, frit and base materials is selected such that: a. the Coefficient of Thermal Expansion of the material of the frit material (CTE<SUB>frit</SUB>) matches with the Coefficients of Thermal Expansion of the material of the lamp base (CTE<SUB>base</SUB>) and the material of the body (CTE<SUB>body</SUB>), respectively, or, b. the material of the frit (CTE<SUB>frit</SUB>) bridges with the Coefficients of Thermal Expansion of the material of the lamp base (CTE<SUB>base</SUB>) and the material of the body (CTE<SUB>body</SUB>), respectively, at least at the joining surfaces of the body, frit and base materials, to sustain a hermetic bonding and withstand pressure and temperature conditions.
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