Analysis of electrical characteristics of commercial led flat panel lights during dimming process

The development of LED technology has made LED lighting widely used. High-efficiency LED drivers enable LED lamps to achieve energy conservation and carbon reduction, which has become a major trend in world lighting. This paper measures the electrical characteristics of 100%, 75%, 50%, 25%, 10%, and 0% of the rated power of commercial LED panel lights, and observes the power factor, current total harmonic distortion, and conversion efficiency. The measurement results of 10 sets of LED panel lights show that the electrical characteristics at rated power all comply with safety regulations, but when dimmed to less than 50% of rated power, many electrical characteristics do not comply with safety regulations. In addition, the rated power of commercial LED panel lights is designed to be below 40W. Although they can operate on 230V, their power factor, current total harmonic distortion, and conversion efficiency are worse than those operating on 120V.