I measured this LED Christmas light string, and got remarkably excited that it has a power factor of 0.96, as it has no capacitance except from the wire. LED Christmas lights are simple, as they don’t contain any electronics or power supply except for a diode bridge and a small resistor that doesn’t dump that much residual voltage as heat. 2.8 watts for the 50 bulb string or roughly 0.05 watts per bulb which makes sense at 3.6 volts dropped at 20 mA.