preheat fluorescent lamp

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preheat fluorescent lamp [′prē‚hēt flu̇¦res·ənt ′lamp]

(electronics)

A fluorescent lamp in which a manual switch or thermal starter is used to preheat the cathode for a few seconds before high voltage is applied to strike the mercury arc.

preheat fluorescent lamp, switch-start fluorescent lamp

A fluorescent lamp in which the electrodes must be preheated in order to start the arc; the preheating is initiated by either a manual switch or an automatic-starting switch.

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