Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1987-10-30
1989-08-01
Mis, David
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313 15, 313623, H01J 6118, H01J 6136, H01J 724
Patent
active
048535974
ABSTRACT:
A rapid restrike metal halide lamp and method of operating such a lamp are disclosed which are particularly suitable for sports stadium lighting applications. The rapid restrike metal halide lamp has an arc tube containing constituents which require a waveform having a relatively high voltage and at a relatively high current in order to rapidly restrike the arc tube after the lamp has experienced a power interruption so as to initiate a sustaining arc condition of the arc tube. The relatively high waveform in the form of a series of pulse trains is routed to the arc tube by means of a two path arrangement comprising a conductive base at the bottom of the lamp and a insulative cap at the top of the lamp. This two-way path substantially reduces and even eliminates any arcing condition within the confines of the lamp. The rapid restrike metal halide lamp may have a keep-alive heater arranged around at least a portion of the arc tube so as to assist in the rapid restriking of the lamp after the lamp has experienced an extended shut-down or cool-down condition. The disclosed method specifies particular ranges for an ignition voltage which obtain the rapid restrike of the arc tube.
REFERENCES:
patent: 3590306 (1971-06-01), Burnham et al.
Heindl Raymond A.
Reiling Gilbert H.
Suster Albert L.
Corwin Stanley C.
General Electric Company
Jacob Fred
McMahon John P.
Mis David
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