Low wattage metal halide discharge lamp

Details Low wattage metal halide discharge lamp Low wattage metal halide discharge lamp

1985-12-27

1990-10-16

Wieder, Kenneth

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313634, 313324, H01J 6134

Patent

active

049637908

ABSTRACT:
A low wattage metal halide discharge lamp includes an evacuated envelope wherein is disposed a heat loss reducing member having an arc tube therein and means for interrupting the circuit for the current flow which sustains the electrolytic sodium loss process. In one embodiment, the circuit interruption means includes supporting the arc tube and dome sleeve by a supporting rod that is affixed by a metal strap to the glass stem within the lamp. The primary circuit interrupting effect occurring upon the heat loss reducing member being supported about the arc tube in an electrically insulated manner so as to create a high path of resistance back to the power supply. A substantial reduction of sodium loss along with improved color constancy and voltage stability resulted from interruption of the electrolysis circuit.

REFERENCES:
patent: 2009215 (1935-07-01), Abshagen
patent: 3250934 (1966-05-01), Pederson
patent: 3407327 (1968-10-01), Koury et al.
patent: 3424935 (1969-01-01), Gungle et al.
patent: 3619682 (1971-11-01), Lo et al.
patent: 3619710 (1973-12-01), Waymouth
patent: 3780331 (1981-07-01), Knochel et al.
patent: 4281274 (1981-07-01), Bechard

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