Arrangement including a gas and/or vapor discharge lamp

Details Arrangement including a gas and/or vapor discharge lamp Arrangement including a gas and/or vapor discharge lamp

1976-03-19

1977-09-27

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315 98, 315107, 315260, 315307, 315334, 315DIG1, 315DIG5, H05B 4114, H05B 4136

Patent

active

040514072

ABSTRACT:
A device for operating a low-pressure sodium vapor discharge lamp without a ballast. The electrode voltage drop near a main electrode of the sodium lamp is influenced by a change in the pre-heating current of that electrode and/or a change in the effective area of the electrode. The changed electrode voltage drop thus obtained provides a mechanism whereby any changes in the lamp current are opposed so as to produce ballast-free lamp operation.

REFERENCES:
patent: 2159767 (1939-05-01), Liebich
patent: 2330312 (1943-09-01), Raney, Jr.
patent: 2668259 (1954-02-01), Stutsman
patent: 3072822 (1963-01-01), Holmes

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