Rapid restrike metal halide lamp and a method of operating such

Electric lamp and discharge devices: systems – Surge generator or inductance in the supply circuit

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315290, H05G 3700

Patent

active

047230975

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: 3189789 (1965-06-01), Howell
patent: 4079292 (1978-03-01), Kaneda
patent: 4441056 (1984-04-01), Siglock

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