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

1988-02-18

1990-06-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Special application

Vehicle

313571, 313634, 313639, 313562, H01J 6120, H01J 6122

Patent

active

049356682

ABSTRACT:
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 a 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.

REFERENCES:
patent: 3398312 (1968-08-01), Edris et al.
patent: 3842304 (1974-10-01), Beyer et al.
patent: 4197480 (1980-04-01), Ryan, Jr.
patent: 4594529 (1986-06-01), de Vrijer
patent: 4808876 (1989-02-01), French et al.

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