Influence of Modern Lamps Number on Electromagnetic Noise Emission

Typically the electromagnetic compatibility - EMC standards used in modern lighting field prescribed measurements for a single device. With help of measurements required by standards the spectrum of noise emission of modern lamp is well known in a wide band of frequency. The question is what happening with noise emission in case when the lamps are working in a network. This paper tries to give an answer for this question. It is analyzed the total harmonic distortion, the conducted and the radiated emission of a network lamps which contains compact fluorescent - CFL and lighting emission diode – LED. In some cases, the variation of lamps number produces a variation of noise emission level. In higher frequency bands the frequency of noise emission depends by length of power supply cable too. The quality of lamps has an influence on the level of noise emissions, because in this case the electronics ballast contains more filters.