Inventors:
Richard C. Marlor - Beverly MA
Karin Naumann - Ober-Olm, DE
Franz Ott - Mitterteich, DE
Ottmar Becker - Langen, DE
Assignee:
Osram Sylvania Inc. - Danvers MA
Schott Glas - Mainz
International Classification:
H01J 6135
Abstract:
A long life, halogen cycle, incandescent lamp ( ) for operation in excess of 85 volts. The lamp comprises a transparent glass envelope ( ) having sealed therewithin a tungsten filament ( ); a pair of electrical lead-ins ( ) connecting the filament and extending exteriorly of the envelope for connection to a supply voltage greater than 100 V; and a fill gas within the envelope, including a halogen, at a pressure of at least three atmospheres. The envelope is constructed of a five component alkaline earth aluminosilicate glass having a composition consisting essentially of, in weight percent from 58 to about 64% SiO , from about 14 to about 17% Al O ; from 0 to about 1% B O , from 1 to about 6% MgO, from about 6 to about 12% CaO, from about 7 to about 17% BaO and from 0 to about 1. 5% ZrO.