Experimental analysis of flicker and power quality in led and cfl lamps subjected to cyclic switching operation
DOI:
https://doi.org/10.37431/conectividad.v7i2.432Keywords:
Electric power quality, LED luminaires, Compact fluorescent lamps, Voltage fluctuationsAbstract
This study presents an experimental analysis of the effect of on/off switching cycles on power quality and electrical flicker severity in light-emitting diode (LED) lamps and compact fluorescent lamps (CFL). Measurements were carried out under controlled laboratory conditions, with a nominal voltage of 127 V and frequency of 60 Hz, applying continuous and cyclic operation modes with 10, 30, and 60 minutes ON followed by 2 seconds OFF during 24-hour tests. Short-term and long-term flicker indices (Pst and Plt) were automatically computed by a Fluke 1775 power-quality analyzer in accordance with IEC 61000-4-15 and IEC 61000-4-30 standards. Results show that LED lamps maintained Plt < 1 under all conditions, fully complying with the IEC flicker limits, whereas CFL lamps reached Plt > 3 under continuous operation, revealing pronounced thermal and electrical sensitivity. The ΔV–Plt correlation confirms that CFL flicker is strongly dependent on voltage variations, while LED drivers exhibit a linear and stable response. Overall, LED technology demonstrates superior immunity to voltage fluctuations and more reliable performance under repetitive switching. It should be noted that Pst and Plt values were derived solely from voltage fluctuation measurements (electrical flicker); no direct photometric assessment of luminous flux was performed.
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