What Type Of Sensor Is Used To Determine When Automatic Headlights Should Turn On?

What Type Of Sensor Is Used To Determine When Automatic Headlights Should Turn On? Today’s automatic headlamps come on whenever the switch is in the “auto” position and it’s dark enough to require them. They use a photoelectric sensor that’s usually mounted on top of the dash, or on the windshield near the rearview mirror.