This document specifies safety requirements for electronic step-down convertors for use on DC supplies of up to 1 500 V or AC supplies of up to 1 000 V, at 50 Hz or 60 Hz and with rated output voltage 50 V (RMS) at a frequency deviating from the supply frequency, or 120 V ripple free DC between conductors and between any conductor and earth, associated with tungsten-halogen lamps as specified in IEC 60357 and other filament lamps. NOTE 1 The limits of 50 V (AC) and 120 V (DC) are in accordance with the ELV (extra low voltage) band of IEC 61140:2016. NOTE 2 Performance requirements are covered by IEC 61047. NOTE 3 Such controlgear can also be used for electric sources producing optical radiation with the same technology used for purposes different than illumination and producing radiation other than visible spectrum.