Degradation of Light Tubes in Ceramic Metal Halide Lamps due to Short Duration Discharge Cycles

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  • 短期放電サイクルによるセラミックメタルハライドランプの発光管劣化
  • タンキ ホウデン サイクル ニ ヨル セラミックメタルハライドランプ ノ ハッコウカン レッカ

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Abstract

Time dependent degradation of a ceramic metal halide lamp equipped with an alumina arc tube has been investigated. An electronic circuit for a short duration discharge was developed to realize accelerated lamp degradation leading to light flux reduction. Light intensity distributions of the lamp tube were obtained from digital camera images. A ratio was computed from the light intensity at the tube center divided by that at the tube edge. It has shown a decreasing trend against the lamp operation time indicating the aging of the alumina discharge tube. The ratio can be utilized as a valid mark to evaluate the degree of degradation of a HID lamp judging from the results of spectroscopic measurements of the lamp plasma.

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