We have developed an adjustable power line impedance emulator (APLIE) for characterization of electrical power consumption of AC-operated energy-saving lamps. The device is connected in series with the AC voltage source and the lamp in order to reduce the sensitivity of the lamp electronics to the output impedance of the AC voltage source. Test measurements conducted for a group of energy-saving lamps showed that some lamp electronics are very sensitive to changes in the source impedance. A difference of 1.2 % was measured for the efficacy of a compact fluorescent lamp (CFL), when using different impedance settings. The APLIE can be used for developing a fixed impedance stabilization network for measurements of energy-saving lamps.
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