security light
noun [ C ] uk/sɪˈkjʊə.rɪ.ti ˌlaɪt/ us/sɪˈkjʊr.ə.t̬i ˌlaɪt/
安全灯（安装在建筑物外面，一旦有人在黑暗中靠近便会自动亮起的警示灯）
an electric light, usually outside a building, that switches on when someone or something moves near it
Burglars tried to break into the house in the early hours, but they were spotted by vigilant neighbours when security lights came on. 小偷凌晨时分企图破门而入，但安全灯亮起，他们被警惕的邻居发现了。
The animal was seen in a back garden when it set off a security light. 这只动物引亮了安全灯，有人看见它在后花园里。
- More examples
- There are infrared-sensing security lights on the wall of the house and if they go on then I'm up and over the wall and away.
- A special type of outside light is the security light, which is switched on by a passive infra-red sensor whenever someone approaches.
- Locked gates, window locks and security lights are considered deterrents by burglars.