Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Method and device for lighting ultra-high pressure discharge lamps
There is provided an improved method of lighting an ultra-high pressure discharge lamp in which a pair of electrodes are disposed confronting each other with a spacing of not more than 1.5 mm therebetween in an arc tube forming part of an envelope of quartz glass, the arc tube encapsulating mercury in an amount of 0.15 mg/mm3, the method including the steps of: reducing a lamp power supplied to the pair of electrodes to a degree such as not to stop arc discharge in a transition state from a lighting state to extinction; keeping the lamp power thus reduced for a predetermined time period; and shutting down the supply of current to the electrodes.
Phoenix Electric Co., Ltd.
H H
H05B H05B
inventional inventional
Toshitaka Andrei
Fujii Kazmierski