Abstract: EMI suppression in electrodeless discharge lamps by inward RF-reflectance from the enclosure walls (12) of 90%+ and use of an absorber (16) of RF power having an absorption coefficient greater than 40%, a transmission coefficient less than e.sup.-3, and an effective area facing the interior of the enclosure between 5% and 40% of the area of the RF-reflective light transmissive enclosure.

Abstract: A clocked power supply circuit is proposed which includes a control arrangement (20) which outputs switching signals (21) to switching means (13) as a function of a load condition present on the output side and which includes at least one inductive element (12). Provided on the output side is a load (22) which is independent of the electric consumer (18), preferably a gas discharge lamp, and is at least temporarily active. It is possible using the load (22) specifically to avoid no-load operation of the clocked power supply by means of a load, as a result of which the system-induced reaction time can be substantially shortened in the case of a short-term energy requirement of the consumer (18). The energy required in the short term can be supplied by the magnetic energy stored in the inductive element (12).