Experts say the answer depends on the type of lighting, how long lights are left on, and whether smart systems are in place.

During the migration, Lights Out Colorado -- a program supported by Dark Sky Colorado and the Denver Audubon -- asks ...

We are destroying half the environment in our city every 24 hours — and most of us don’t know it. You may not have noticed because you were probably asleep while it was happening. Namely, we are ...

Scientists have discovered alarming connections between sleeping with lights on and serious health problems. Even minimal ...

Huntsville Utilities is asking customers in the Tennessee Valley to reduce their power consumption as the year’s first extended heat wave settles over the region. Heat advisories are in place for much ...