The TDOS5-JM is equipped with CDS technology, so the ambient light in the room will effect the triggering of the lights. The CDS sensor will learn your usage habits of how much light is in the room when you turn the lights on or off. To train the sensor, set the device to OCC mode. Then turn On the lights when the room reaches the darkness level that you want the lights to turn On and turn the lights Off at the brightness level that you want the room to be. After a few times of manually turning the lights on and off, the CDS sensor will learn your habits and will automatically run the “learned” settings.