Metal halide lamp having vacuum shroud for improved performance

Details Metal halide lamp having vacuum shroud for improved performance Metal halide lamp having vacuum shroud for improved performance

H - Electricity

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J

313/10, 313/137

H01J 61/34 (2006.01) H01J 61/06 (2006.01) H01J 61/20 (2006.01) H01J 61/26 (2006.01) F21M 3/08 (1990.01)

Patent

CA 1309452

LD 9804 METAL HALIDE LAMP HAVING VACUUM SHROUD FOR IMPROVED PERFORMANCE ABSTRACT OF THE INVENTION A metal halide lamp having a vacuum shroud is disclosed. The vacuum shroud substantially eliminates the detrimental catephoresis effects of operating a metal halide lamp from an low frequency alternating current (A.C.) source or direct current (D.C.) sources, reduces the sodium migration losses typically experienced with a metal halide lamp, reduces the photoelectrons contribution to sodium losses for the metal halide lamp, reduces the detrimental effects of the hydrogen and water that may be within the general confines of such a metal halide lamp, and provides a containment function for an inner envelope that may be operated at a relatively high pressure and possibly experience rupturing to cause the dislodgment of the ruptured material to possibly fracture a glass member confining the metal halide lamp.

592537

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