High intensity discharge lamp containing electronic starting aid

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 60, 315 74, 315100, 315DIG7, H01J 744, H01J 1734, H01J 1978, H01K 162

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active

043226582

ABSTRACT:
A high intensity discharge lamp comprises a two-electrode arc tube and an external starting probe supported from a base and preferably sealed within an outer envelope to which the base is attached. The base contains an electronic pulsing circuit comprising a capacitor connected in a charging circuit across the base terminals, a pulse transformer having its primary connected in series with a voltage sensitive switch across the capacitor, and a step-up secondary connected to the probe. After starting, the voltage across the capacitor drops below the breakdown level of the switch and pulsing stops.

REFERENCES:
patent: 2266662 (1941-12-01), Spanner et al.
patent: 3666986 (1972-05-01), Lake et al.
patent: 3963958 (1976-06-01), Nuckolls
patent: 4064416 (1977-12-01), Krense et al.
patent: 4134042 (1979-01-01), VanHeemskerck
patent: 4223247 (1980-09-01), Jacobs et al.

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