Hid sodium lamp which incorporates a high pressure of xenon and

Details Hid sodium lamp which incorporates a high pressure of xenon and Hid sodium lamp which incorporates a high pressure of xenon and

1977-12-05

1979-12-18

Smith, Alfred E.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament, electric heater, or resistance in shunt with the...

315 58, 315 71, 315 73, 315DIG5, H01J 1734

Patent

active

041796403

ABSTRACT:
High-intensity-discharge sodium lamp incorporates as a starting gas xenon at a pressure between 50 and 300 torrs, in order to improve the lamp efficiency and the spectral power distribution of the discharge. To facilitate lamp starting on a conventional pulse-type starting circuit, a trigger electrode is wrapped about the exterior of the arc tube proximate one of the lamp electrodes, with the potential applied to the trigger electrode during lamp starting being the same as that which is applied to the other or more remote lamp electrode. The starting pulse applied between the trigger electrode and the proximate lamp electrode initiates the lamp discharge. The trigger electrode also extends along the outer surface of the arc tube contiguous therewith toward the other electrode and the discharge, once initiated, progresses toward the other electrode. If the arc tube is pervious to the migration of sodium ions therethrough under the influence of an electric field during the normal lamp operation, the trigger electrode is effectively removed from the circuit by a switch or a high impedance to prevent such sodium ion migration.

REFERENCES:
patent: 3248590 (1966-04-01), Schmidt
patent: 3384798 (1968-05-01), Schmidt
patent: 3721845 (1973-03-01), Cohen et al.
patent: 3746914 (1973-07-01), Olson et al.
patent: 3755708 (1973-08-01), Audesse
patent: 3757158 (1973-09-01), Kopelman
patent: 3757159 (1973-09-01), Gutta et al.
patent: 3900753 (1975-08-01), Richardson
patent: 4037129 (1977-07-01), Zack et al.
patent: 4072878 (1978-02-01), Engel et al.

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