Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device
Patent
1976-02-04
1977-04-26
Demeo, Palmer C.
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For plural electrodes of discharge device
H01K 150
Patent
active
040203808
ABSTRACT:
The useful life of high-efficiency type bromine-tungsten cycle incandescent lamps, such as those used in TV-studio and theater lighting applications, is enhanced by dosing the lamps with a carefully controlled quantity of mercuric bromide (HgBr.sub.2) which dissociates when the filament of the finished lamp is energized and provides a predetermined amount of Br.sub.2 within the envelope during lamp operation. The quantity of HgBr.sub.2 dosed into the envelope is adjusted according to the design life and initial efficiency parameters of the specific lamp type so as to provide a concentration of Br.sub.2 within the envelope which is correlated with such parameters and prevents blackening of the envelope and premature failure of the filament at the particular "life-efficiency level" of operation for which the lamp is designed. For a 1000 watt 120 volt tubular incandescent lamp (DXW type) having a design life of 150 hours and an efficiency of 28 LPW, the HgBr.sub.2 dosage is such that it provides from about 2.5 to 6 torr of Br.sub.2 within the lamp during operation -- whereas a lamp of the same wattage and voltage rating designed to operate for 50 hours at 33 LPW (DXN type) is dosed with a slightly larger quantity of HgBr.sub.2 to provide from about 3.5 to 8.5 torr of Br.sub.2 within the operating lamp.
REFERENCES:
patent: 3384774 (1968-05-01), English
patent: 3497754 (1970-02-01), Johnson
Kulkarni Avinash D.
Newton Ralph E.
Buleza D. S.
DeMeo Palmer C.
Westinghouse Electric Corporation
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