High pressure mercury vapor discharge lamp

Details High pressure mercury vapor discharge lamp High pressure mercury vapor discharge lamp

1976-04-08

1977-04-26

Demeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313184, 313218, 313220, 313225, 313229, H01J 61068, H01J 6118, H01J 6133, H01J 6140

Patent

active

040203778

ABSTRACT:
An improved high pressure mercury vapor discharge lamp having a high color emperature together with high luminous efficacy and a high color rendering. This is accomplished by including in the filling halides of at least one of the rare-earth metals dysprosium, holmium, thulium, erbium, and terbium; together with the halides of at least one of the alkali or alkaline earth metals; and including a filtering agent for radiation in the blue spectral region. The lamp is preferably of isothermal design. The electrodes preferably contain 1-3% of Dy.sub.2 O.sub.3.

REFERENCES:
patent: 3530327 (1970-09-01), Zollweg et al.
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 3753018 (1973-08-01), Beijer et al.
patent: 3842307 (1974-10-01), Dobrusskin et al.

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