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Old 04-24-2002, 01:39 PM   #6 (permalink)
Chippp
 
Join Date: Apr 19 2001
Posts: 2,262
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Some of the 160 watt lamps we buy have "cooling rings" some brands don't.
The ones that don't get blacker on the ends faster. The ring is a flat round disk that is on the base of the electrode.
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