METAL VAPOUR DISCHARGE LAMP

摘要

PHN 8375 28.3.77 The invention relates to a high-pressure sodium vapour discharge lamp which comprises a discharge tube provided with an external starting electrode. In accordance with the invention the lamp comprises a transformer wherein the secondary winding of the transformer is connected between the starting electrode and a main electrode of the discharge tube, the primary winding of that transformer being included in an oscillatory circuit including a glow starter. Also those further components of the starting circuit form part of the lamp. In this manner it is achieved that a proper starting of the lamp can be combined with only low requirements as regards the insulation near the input terminals of the lamp. Figure n..1.