In this mode, the light work like regular light bulb, just use a switch to turn it off and on. The light automatically turns on when the sensor detects motion. When the Lux knob is adjusted to the maximum, the light will turn on when motion is detected during both day and night. While the Lux knob is adjusted to the minimum, the light will only turn on when motion is detected at night. The light automatically turns itself off when no further motion is detected after a certain amount of time according to your setting. The built-in photocell featuring the light automatically turns on at dusk and then turns off at dawn.