What happens if I close the Daylight Dimmer?

Because the Solatube Daylight Dimmer only blocks out 98% of daylight when closed, the Solar Electric NightLight will not trigger the Dusk to Dawn Daylight Sensor to turn on the LED emitters under normal daylight conditions.

However, in less than ideal conditions (overcast/dark, stormy conditions), if the Daylight Dimmer is closed, the Solar Electric NightLight may turn on during the day.