High efficacy metal halide lamp with praseodymium and sodium...

Details High efficacy metal halide lamp with praseodymium and sodium... High efficacy metal halide lamp with praseodymium and sodium...

2005-12-27

2005-12-27

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C313S638000

Reexamination Certificate

active

06979958

ABSTRACT:
An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls of a selected shape about a discharge region of a selected volume. A pair of electrodes are supported in the discharge region separated from one another by a separation length. The separation length is in a ratio to the effective inner diameter that is greater than four. Ionizable materials are provided in the discharge region comprising a quantity of mercury in a ratio to the discharge region volume that is less than 4 mg/cm3, a noble gas, praseodymium halide, and sodium halide.

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