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