Street lighting with photoelectric switch. The switch (red,top of light) is sensitive to light. As the light levels fall as the Sun sets (as seen here),the switch triggers the street light and turns it on. A photoelectric switch uses an LDR (light-dependent resistor) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Chillmaid, Martyn F. |
Taille de l’image : | 4256 px × 2848 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |