How do street lights turn on at dusk and off at dawn? Also, why do some lights turn on at different times than others?
Street lights are controlled by photo electric cells. These devices sense the amount of daylight and turn the street light on and off at preset light levels. Some street lights are controlled individually, whereas some jurisdictions, such as the BC Ministry of Transportation, control street lights in groups.
Related Questions
- Sometimes the lights turn on automatically when I enter the room, other times they remain off. Why dont they always turn on?
- How do street lights turn on at dusk and off at dawn? Also, why do some lights turn on at different times than others?
- Why do some street lights turn off when I walk near or under them?
