ELECTRIC ARRANGEMENT INCLUDING AT LEAST ONE GAS AND/OR VAPOUR DISCHARGE TUBE

摘要

1 PHN 9169 The invention relates to an electric arrangement comprising two series-arranged discharge tubes which are provided with preheatable electrodes and which are stabilized by means of a relatively small ballast. The tubes are shunted by a semi-conductor switching element which operates in the operating condition of the tubes. According to the invention a control circuit of the semi-conduator switching element includes a non-linear circuit element which ensures that the discharge tubes do not ignite bafore the electrodes are in tha warm stake.