Coated arc tube for sodium vapor lamp

Details Coated arc tube for sodium vapor lamp Coated arc tube for sodium vapor lamp

1992-12-18

1998-12-01

O'Shea, Sandra L.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313489, 313634, 313635, H01J 162

Patent

active

058443509

ABSTRACT:
High pressure sodium arc vapor discharge lamps employing an alumina arc tube exhibit less voltage rise and better lumen maintenance over the life of the lamp when the arc tube is coated with an oxide of a metal selected from the group consisting essentially of yttrium, zirconium, hafnium, lanthanum, dysprosium, scandium and mixture thereof.

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patent: 5270615 (1993-12-01), Chang

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