| 摘要 |
An arc discharge lamp ( 10 ) has a lamp envelope ( 12 ) and an arc discharge vessel ( 14 ) mounted within the envelope ( 12 ). An arc centering structure ( 60 ) is positioned within the arc discharge vessel for substantially centering the arc. The centering structure ( 60 ) is preferably fixedly mounted within the arc discharge vessel ( 14 ) and preferably comprises a metal annulus ( 62 ) that incandesces during lamp operation and adds to the light output of the lamp. In a preferred embodiment, the lamp is suitable for vertical or horizontal operation.
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