Immunity test of LED lamps based on IEC 61000-4 19 and unexpected consequence

LED lighting technology is the most efficient way of lighting service and its usage has increased rapidly. Although, LED lamps are potential victim and source of electromagnetic interference in the frequency range between 2 kHz and 150 kHz (“supraharmonics”). Therefore, immunity test for this frequency range is necessary to analyze its performance variations. In this study, Test profiles described in IEC 61000-4-19 have been applied to LED lamps and the results have been analyzed according to implemented algorithm that uses the relative light intensity variation index. The results show that both supraharmonics and modulation of the test profiles can reveal light flicker. In addition, some potential drawbacks of the standard have been found that deviation of the mains' frequency is also another factor causes intermodulation/non- synchronization on the applied test signal, so this can be seen as light flicker. This issue better be clarified with more details in the IEC 61000-4-19, particalulary for lighting equipment