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Evaluation of input harmonic characteristics of LED lamps connected to utility grid

In this paper an attempt is being made to explore the harmonic currents exchanged with the utility-grid by the various types of LED lamps which are commercially available in the Indian consumer market. Total harmonic distortion in input current (THDI) and input power factor (IPF) are identified as critical performance indices. Various types of LED Lamps are investigated for the above performance indices at different power levels and are compared with the IEC 61000-3-2 guidelines. The investigation has not only resulted in the identification of good products available in the market and improved understanding of their electrical characteristics, but it has also culminated in providing us a way to enhance the performance of an individual LED lamp when used in cluster with other variants.