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The shaped technique of the electric arc tube's shell with neck, which is used in the small power metal-halide lamp, is introduced in this paper. 超小功率高強度氣躰放電燈電弧琯電極極間距誤差要求小，二電極對中要求高，所以採用在電弧琯泡殼兩耑加縮頸來定位電極。