LED lighting system with the proposed pseudo-sine-current (PSC) controller removes most of the external passive components, which include inductor, electrolytic capacitor (E-cap), freewheel diode, blocking diode, and the bleeding circuit for Triac dimming control, for low cost and small volume. Besides, 1.1W and 2.2W power loss are reduced in Triac dimming control to get high efficiency of 85% at 110Vrms and 87% at 220Vrms, respectively. Furthermore, High PF of 0.98 at 110Vrms and 0.96 at 220Vrms, and low THD of 18% at 110Vrms and 19% at 220Vrms are also achieved owing to in-phase line voltage and current.