To turn on at night when there is activity such as my daughter leaving the sleepout?
Jaxson: Covering the sensor should help you set it up by mimicking night time darkness.
Or wait until it's a bit darker and you can set it up for that exact level.
kiwitrc: Turn the knob towards the crescent moon, this sets the light to come on when its dark,turn the other one towards the + sign which is the time it stays on for.
How is life in the apple ecosystem ;)
richms: With how the plastic looks it is probably old and broken.