Metal halide arc discharge lamp having electrolysis...

Details Metal halide arc discharge lamp having electrolysis... Metal halide arc discharge lamp having electrolysis...

H - Electricity

01

J

313/10, 313/125

H01J 61/00 (2006.01) H01J 61/54 (2006.01) H01J 61/82 (2006.01)

Patent

CA 1189563

METAL HALIDE ARC DISCHARGE LAMP HAVING ELECTROLYSIS PREVENTION MEANS ABSTRACT OF THE DISCLOSURE A high-pressure metal halide arc discharge lamp having an arc tube with a pair of main electrodes disposed within the tube at opposite ends and a starting electrode located adjacent one of the main electrodes. A tubular sleeve of insulating material, such as quartz, is disposed about the starting electrode, which is recessed within the sleeve but exposed through the open end thereof to the interior atmosphere of the arc tube. Since the starting electrode does not project beyond the open end of the sleeve, conduction between that electrode and the adjacent main electrode is minimized or prevented during normal lamp operation, thereby minimizing or preventing electrolysis.

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