| part of an electric lamp which provides connection to the power supply by means of a lampholder or lamp connector and, in most cases, also serves to retain the electric lamp in the lampholder Note 1 to entry: In some cases a cap serves as a thermal connection to the luminaire (or its heatsink). Note 2 to entry: A cap can be an integral part of an electric lamp. Note 3 to entry: This entry was numbered 845-08-15 in IEC 60050-845:1987.
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