Pulse start lamps - HPS and Metal Halide

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peter d

Senior Member
Location
New England
Why do pulse start HID lamps contain a small metal disk at the base of the lamp connected to one of the electrodes? This metal disk sits directly opposed to a metallic coating on the inside of the lamp.

I am guessing this is a crude capacitor of sorts, but what purpose does it serve in the lamp function? Obviously it serves a useful function or else it wouldn't be there. ;)
 
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