The development of 700W Metal Halide Lamp adapted Mercury Ballast

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  • 700Wタイプ水銀灯安定器適合型メタルハライドランプの開発

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New 700W Metal Halide Lamp adapted Mercury Ballast has been developed. New one makes lamp efficacy increased by 10% compared with conventional one. Concerning life span, it extends for 3,000 hours. Higher wall loading is capable of lamp efficacy increasing. This results in high vapor pressure of halide, which causes thinner arc. Adding to this, lamp current is high compared with low wattage: 100-400W. These matters occur unstable arc like snaking and bending. Unstable arc has temperature of quartz wall increased. And lumen maintenance is low. Because high temperature is easy to generate Sc2Si2O7 and ScSi, quartz tube is whitening. On this new lamp, CsI is filled additionally as measure against unstable arc. Some tests show filling CsI by 8.0mol% is effective in improving lumen maintenance.

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