This paper presents the results of the experimental evaluation of electrical characteristics of 28 LED lamps from 13 different manufacturers. The tested LED lamps are with rated powers in range 3 W-25 W and are available on the EU market for use in typical residential lighting applications. Presented results confirm significant differences in electrical characteristics of different LED lamps, e.g. in terms of their current waveform shapes, harmonic emissions and operational power factors. This makes LED lamps significantly different from other residential light sources (e.g. CFLs), which typically have similar electrical characteristics, suggesting that different models should be used for the analysis and standardization of a variety of LED lamps currently available on the market. Based on the general operating principles and typical circuit topologies, as well as analysed electrical characteristics, all tested LED lamps are classified into four types. The paper also considers impact of different supply conditions, i.e. ideally sinusoidal and typically distorted voltage waveforms with five different magnitudes, as well as two source impedance values, on the changes of electrical characteristics and presented classification of tested LED lamps.

According to current energy efficiency labels, the majority of LED lamps on the market are considered as highly efficient devices. This makes it difficult to distinguish between lamps with different operational characteristics and performance. This paper introduces a comprehensive experimental-based labelling methodology for comparing LED lamp performance with reference to two additional important characteristics: light flicker and power factor. The new labelling methodology reveals that there is high diversity between different LED lamps with different circuit topologies but also for a given topology with different design choices. General consumers and design engineers can benefit from the simple and clear information presented by the set of comparative labels when comparing LED lamp performance.

Light emitting diode (LED) lamps are now an established lighting technology, which is becoming prevalent in all load sectors. However, LED lamps are non-linear electrical loads, and their impact on distribution system voltage quality must be evaluated. This paper provides a detailed analysis of time domain and frequency domain approaches for developing and evaluating models suitable for use in large scale steady-state harmonic power flow analysis of the low frequency (LF) emission of LED lamps. The considered approaches are illustrated using four general categories of LED lamps, which have been shown to cover the vast majority of LED lamps currently available on the market. The aim is an in-depth assessment of the ability of commonly applied models to represent the specific design characteristics of different categories of LED lamps. The accuracy of the models is quantitatively evaluated by means of laboratory tests, numerical simulations, and statistical analyses. This provides an example, for each LED lamp category, of comprehensive information about the overall accuracy that can be achieved in the general framework of large scale LF harmonic penetration studies, particularly in the assessment of voltage quality in low voltage networks and their future evolution.

This paper presents a tunable flicker meter based on a generalized lamp model that is able to account for lamp technologies different from incandescent. The generalized lamp model is based on the use of only three input parameters derived from the type of the lamp and its electrical circuit. The flickermeter concept and scheme are described. Compliance with the Standard IEEE 1453 (IEC 61000-4-15:2010) is demonstrated and performances for different lamp technologies are demonstrated by means of numerical and laboratory experiments.

The paper presents an analysis of the voltage fluctuations caused by interharmonics and its influence on luminous flux fluctuations of used combinations of fluorescent lamps and ballasts. One of the analysis results is a concept determining light sources sensitivity to such disturbing type based on frequency components utilization. Further a complex measured data file of sensitivity curves in various combinations of fluorescent lamps and ballasts are pointed. Measured and compared combinations include various types of fluorescent lamps, various wattages, modes of operation of the ballast and its specific designs and dimensioning of circuit elements etc.