Abstract: A projector lamp, comprising a hollow lamp housing having an opening formed at the first end thereof; a power supply adaptor, mounted within the lamp housing and in communication with an external power supply via a second end of the lamp housing; a lighting module, mounted inside the lamp housing and comprising a circuit board and a plurality of light emitting diode units, the circuit board being electrically connected with the power supply adaptor, and the plurality of light emitting diode units being electrically mounted on the circuit board to emit light when the projector lamp is energized; a lens, mounted at the opening of the lamp housing such that light emitted by the plurality of light emitting diode units projects out therethrough; and an adjusting assembly, having an adjusting ring and a controller, the adjusting ring being mounted on the outer periphery of the lamp housing around a longitudinal axis of the lamp housing extending from the first end to the second end thereof.