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Metal-halide lamp
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===Base=== Some types have an [[Edison screw]] <!-- No Mogul bases? Edison screw seems awfully small for 18 kW! --> metal base, for various power ratings between 10 and 18,000 watts. Other types are double-ended, as depicted above, with R7s-24 bases composed of ceramic, along with metal connections between the interior of the arc tube and the exterior. These are made of various alloys (such as iron-cobalt-nickel) that have a thermal coefficient of expansion that matches that of the arc tube.
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