A sensor lamp using an LED(Light Emitting Diode) is provided to secure ambient illuminance even in interruption of electric power by being operated with a storage battery included inside. A rectification unit(110) converts a commercial AC voltage into a DC voltage. A power conversion unit(120) supplies operation power to a plurality of LEDs by converting rectified voltage outputted from the rectification unit. A storage battery(130) is charged by being coupled to the power conversion unit and supplies the operation power to drive the LEDs in interruption of electric power. A sensing unit(140) includes a human sensor and an illuminance sensor. A microcomputer control unit(150) controls switching of the LEDs according to a signal outputted from the sensing unit. An LED light source(160) includes the LEDs.
