Phoenix Electric Co., Ltd.

Toshitaka Hujii

Atsuji Nakagawa

Tomihiko Ikeda

Tetsuya Shirai

Hisao Hurukawa

There is provided a novel method of lighting an ultra-high pressure discharge lamp (A ) having a discharge bulb ( ) made of quartz glass in which a pair of electrodes ( ) and ( ) are disposed facing each other, the method including: lighting the lamp with alternating current; and providing a time period of at least one second for which the alternating current assumes a lighting frequency of 5 Hz or lower during a period for which the lamp lights, wherein the electrodes ( ) and ( ) each have a current withstanding capability against a current 1.5 times or more as high as a current value at which the lamp lights stably. This method enables the ultra-high pressure discharge lamp to have a longer life and exhibit a higher luminance.

ULTRA-HIGH PRESSURE DISCHARGE LAMP LIGHTING METHOD, ULTRA-HIGH PRESSURE DISCHARGE LAMP TO WHICH THE METHOD IS APPLICABLE AND BALLAST FOR USE THEREIN, AND LIGHTING SYSTEM INCORPORATING THE LAMP AND THE BALLAST

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Himeji, Japan

Toshitaka Hujii