How can the light source distinguish between sensibility and resistance?
Light source having pure resistance and almost no pure sensibility.
The light source itself, almost all resistance, because most belt driving circuit, such as ballasts (fluorescent lamp), transformer (high pressure mercury lamp etc.), DC (LED lamp) and so on, so the power factor of the circuit is less than 1.
From electrical performance, to distinguish between inductive and resistive, look at power factor, pure resistance power factor of 1 (incandescent lamp), or else it is perceptual.
