| 摘要 |
A device 2 for controlling public space lighting comprises means 12, 12, 22 for providing a first (decreased) voltage or a second (increased) voltage to a public space light 18. The device 2 supplies the second (increased) voltage to the light 18 when the presence of a person or vehicle is detected by a sensor 28 of the device 2 or when another similar device indicates that such a presence has been detected. When the presence of a person or vehicle is not detected for a pre-set period of time, the first (decreased) voltage is supplied to the light 18. The device 2 reduces the amount of energy consumed by the light 18 when a person or vehicle is not detected as being nearby but still maintains a low level of light. |
