Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1990-02-07
1992-08-04
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313639, 313640, 313642, H01J 1720, H01J 6120
Patent
active
051362082
ABSTRACT:
A prescribed amount of tin halide is sealed in the arc tube of a metal halide lamp wherein a given amount of metal halide including a target amount of halogen and at least a predetermined amount of rare earth metal is sealed in the arc tube thereof to maintain a high lumen maintenance factor for an extended operation period. The prescribed amount of tin halide is preferably within 4.6.about.234 mol % of the predetermined amount of rare earth metal.
REFERENCES:
patent: 4171498 (1979-10-01), Fromm et al.
Furuya Mamoru
Honda Kazuo
Kawashima Hiromichi
Mitsuyuki Youichiro
Mori Yasuki
Hamadi Diab
Toshiba Lighting & Technology Corporation
Yusko Donald J.
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