Abstract: A thermal-switch instant starter for a fluorescent light which initiates a high voltage instantly across its electrodes comprises a high voltage initiating tube including therein a fixed electrode and a movable electrode oppositely spaced from each other to form a short circuit for initiating the fluorescent light. The movable electrode is a thermal switch constantly disposed in contact with a heater element which is disposed on the fixed electrode. An SCR automatic charging and discharging circuit is connected between the fixed and movable movable electrodes and automatically control the charging and discharging process.