At night, a sensor will automatically switch on the light's LED bulb, which can shine for about 8-10 hours after a full charge. The light sensor will then switch them back off again at dawn.

Using a measure of brightness called “magnitude per square arc-second,” the brightest, Monday-Night-Football night sky is about 16 mpsas, and the darkest sky, with zero light pollution, is 22.

Not long ago, one could gaze at the night sky and see the Milky Way. Light pollution, or artificial light at night, now significantly impedes our view of the Milky Way; air pollution contributes, too.