An alternating current (AC) light-emitting diode (LED) lamp includes a first AC power end (AC1), a second AC power end (AC2), a lighting module (1, 1') and a direct current (DC) power output circuit (2, 3, 4, 5). The lighting module (1, 1') has a first end (V1), a second end (V2) and at least one LED unit (11 and/or 12, 12'), wherein the first end (V1) is electrically coupled to the first AC power end (AC1). The at least one LED unit (11 and/or 12, 12') has one or more LEDs connected in series. The DC power output circuit (2, 3, 4, 5) has a first end (V3) and a second end (V4), wherein the second end (V4) of the DC power output circuit (2, 3, 4, 5) is electrically coupled to the second AC power end (AC2), while the first end (V3) of the DC power output circuit (2, 3, 4, 5) is electrically coupled to the second end (V2) of the lighting module (1, 1'). The DC power output circuit (2, 3, 4, 5) has a DC output side (20, 30, 40, 50).