## 1 Introduction
If the manufacturer has not introduced appropriate EMC solutions into these power supply systems of LED lamps, they may be a source of electromagnetic disturbance emissions EMI, which may adversely affect the operation of other equipment. Given that LED lamps and other light sources play a significant role in people's lives, as they are used to illuminate open spaces, thorough flares, architectural structures, and room interiors, they form, together with their accessories, a significant group of devices. It is estimated that global energy consumption for lighting in 2005 was 2650 TWh, representing 19% of global electricity consumption [5]. Compatibility requirements and the significant contribution of lighting fixtures to electricity consumption result in this group having its own dedicated standard: EN IEC 55015:2019-11 [6]. An analysis of the publications indicated that the problem of conducted and radiated disturbance generation by LED lamps is significant [7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18]. As indicated by the results of studies contained in publications [7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18], LED lamps can have a negative impact on the operation of sensitive electronic devices: consumer, medical, IT, military, etc. In critical cases, they can cause a sensitive device or system to lose its function or even be damaged. The cases analysed in the publications [7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18] show how LED lamps can cause falsification of the information transmitted in medical or IT systems. It is therefore very important that any sensitive equipment should have an adequate level of immunity to any possible disturbance that may occur in its operating environment and that potential sources of disturbance located in the vicinity of such equipment should have the emission levels specified in the adequate EMC standards. In the search for an answer to the nagging problem regarding the equivalence of results obtained using the SAC and CDNE methods, a number of thematic publications on the phenomenon of radio disturbance generation by LED lamps were analysed. As shown by the analysis of publications from the last decade [10; 11; 12; 13; 14; 15; 16; 17; 18], with the widespread introduction of LED lamps into lighting technology, the problem of disturbance generation with a sufficiently broad harmonic spectrum exceeding 300 MHz was recognised. This is reflected in the increase of the current EN IEC 55015:2019-11 [6] standard in question, which extends the range of disturbance analysis to 1 GHz. The analysis carried out showed that the problem regarding the compatibility of the radio disturbance emission measurements generated by LED lamps using the SAC and CDNE methods have described in a small number of publications [13; 14]. In article [13], the authors presented the results of the research carried out, among others, in terms of comparing the SAC and CDNE methods. They showed that measurements obtained with the CDNE method can give results that are discrepant with the SAC method. In the case of publication [14], the authors compared the results obtained with the GTEM comeasurement method with those obtained with the CDNE method, also finding significant discrepancies between the results of one method and the other.