Most CCTV (Closed-Circuit Television) cameras require some level of light to capture images or video. The majority of traditional CCTV cameras rely on visible light to capture scenes effectively. In low-light conditions, they may utilize infrared (IR) light to enhance visibility.
However, there are specific types of cameras designed for capturing images in extremely low-light or even complete darkness. These cameras are commonly referred to as "night vision" cameras. Night vision cameras use technologies such as thermal imaging or infrared illumination to produce images even when there is no visible light available. These cameras can detect and capture infrared radiation emitted by objects or use IR illuminators to illuminate the scene with invisible light.
So, while conventional CCTV cameras heavily rely on light for proper functioning, specialized night vision cameras can operate in low-light or darkness using alternative technologies.