IMPROVED STARTING CIRCUIT FOR LOW-PRESSURE DISCHARGE LAMP

摘要

A starting circuit for controlling lamp current of a low pressure discharge lamp during the starting phase of the lamp. The starting circuit includes a temperature sensor which measures temperatures that are dependent on the lamp temperature. The starting circuit may also include a photo detector for measuring the luminous flux of the lamp or a voltage measuring device for measuring the running voltage of the lamp. The circuit includes means for controlling the lamp electrical current dependent on outputs of the aforesaid sensors to increase the level of luminous flux produced by the lamp during starting phase.