| 摘要 |
<p>Device (6) for switching on and off a light source (2) in a lighting unit (1) that is designed to form part of a group of lighting units (21-25) arranged along a stretch of road, track or the like, which device comprises a timing circuit (9) designed to generate a signal (41) corresponding to an activation period (A) for a light source (2) comprised in the lighting unit (1) and a movement detector (10) which is arranged to detect moving objects such as persons and vehicles in its detection area (42) and, when that occurs, to generate an activation signal (43). The object is to save energy when lighting stretches of private roads, footpaths, cycle tracks, ski tracks, running tracks or the like, as the lighting is switched on only for the stretch or time that a person or vehicle is in the vicinity when it is dark. The lighting can be designed so that a number of energy-efficient white light-emitting diodes are used, which obtain their energy via an accumulator and are charged by a solar cell panel. The solar cell panel then detects whether it is sufficiently dark for the lighting to be switched on.</p> |
