节能灯
功率因数: 根据实际的情况选择 PF>0.6 及 PF>0.9
EN 61347里面有关于功率因数的定义
circuit power factor
power factor of the combination of lamp controlgear and the lamp or lamps for which the lamp
controlgear is designed
3.15
high power factor ballast
ballast having a circuit power factor of at least 0,85 (leading or lagging)
NOTE 1 The value 0,85 takes into account the distortion of the current waveform.
NOTE 2 For North America, a high power factor is defined as a power factor of at least 0,9.