High intensity discharge lamp with coating on arc discharge tube

Details High intensity discharge lamp with coating on arc discharge tube High intensity discharge lamp with coating on arc discharge tube

1979-05-14

1981-07-28

Demeo, Palmer C.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313 44, 313 47, 313221, H01J 6135

Patent

active

042812674

ABSTRACT:
In high intensity discharge lamps, particularly those that are configured to operate in a particular orientation, end coatings are provided which increase the efficacy of the lamp. In one embodiment of the present invention, reflective end coatings are provided exteriorly and at the ends of the discharge tube except for an approximately semicircularly shaped portion through which the optical output of the lamp radiates. The particular coating pattern provided in the present invention reduces the number of internal reflections occurring within the discharge tube and accordingly increases the efficacy of the lamp.

REFERENCES:
patent: 2951967 (1960-09-01), Naxon
patent: 3234421 (1966-02-01), Reiling
patent: 3445719 (1969-05-01), Thouret et al.
patent: 3753019 (1973-08-01), Hellman
patent: 3858078 (1974-12-01), Koury
patent: 3883763 (1975-05-01), Kearney
patent: 3900750 (1975-08-01), Bamberg et al.
patent: 3963951 (1976-06-01), Bamberg

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