High pressure sodium vapor lamp having resistance heater means

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Filament – electric heater – or resistance in shunt with the...

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315 46, 315 73, 315116, 315117, H05B 4116

Patent

active

044423780

ABSTRACT:
An improved high pressure sodium vapor lamp is described having resistance heater means contained within a tubular light-transmitting ceramic envelope that further contains a reservoir of sodium-mercury amalgam in excess of the quantity vaporized during lamp operation in order to heat the ceramic envelope before lamp starting and thereby reduce the starting voltage requirements. In the preferred embodiment, said resistance heater means comprises a refractory metal coil wound around the tungsten shank of one thermionic electrode and electrically insulated therefrom and which is supplied with lower current than is subsequently applied to said electrodes for the lamp operation.

REFERENCES:
patent: 3851207 (1974-11-01), McVey
patent: 4182976 (1980-01-01), Larson

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