Why power factor correction for Capacitive load is more difficult?
An LED lamp is a non-linear load not a capacitive load. Non-linear loads cause current waveform distortion. The distortion has the effect of adding harmonic currents to the load current. Harmonic currents do not transmit power, so they have the same effect as reducing the power factor. However harmonic currents can not be compensated using conventional power factor correction techniques. Harmonic filters are required.