Normally, after setting the sunrise and sunset time, the light is supposed to turn off after sunset time. If the timer doesn’t work, we assume that the nightlight after sunset time of your light is not set to complete off. This means the light will automatically keep the same light intensity as daylight after sunset instead of going off. To make the light to turn/off automatically, please wait until after sunset time you set. Then press the "–" button to manually set the light intensity of W+UVA/UVB/FR to 0%. Once adjusted, your light will follow your configured sunrise and sunset schedule, turn on/off automatically as intended.