an electrodeless lighting system and its control method are disclosed . when the electrodeless lighting system starts , a larger amount of filament current of a magnetron is applied to stably drive the magnetron , and when the electrodeless lighting system operates normally , a smaller amount of filament current is applied , thus avoiding interference with a wireless lan , lengthening a life span of the magnetron , reducing noise , and improving an operational efficiency of the electrodeless lighting system .