Why are there LEDs around a CCTV camera?

The LEDs are not normal LED at home, they are IR LED which give red light at night and turn off at day time. There is a light sensor under the camera lens which control the LED turning on or off. LED lighting works much better than traditional lighting solutions, such as lower energy consumption and Superior quality illumination.

The LEDs are not normal LED at home, they are IR LED which give red light at night and turn off at day time. There is a light sensor under the camera lens which control the LED turning on or off. LED lighting works much better than traditional lighting solutions, such as lower energy consumption and Superior quality illumination.

The digital CCTV camera is like eyes of human and it also need to work at night, so the LED need to provide different wavelength from the sunshine. There about three kinds of range:

715-730nm - overt IR, produces a red glow like a red traffic light.
815-850nm - semi-covert IR with a faintly red glow only just visible.
940-950nm - covert IR invisible to the human eye.

Infra-Red light can be used to provide discrete or covert illumination for CCTV; to minimise light pollution; or to provide very long distance illumination. IR can be used with monochrome and day/night cameras. NB. As IR becomes more covert it becomes more difficult for the camera to see and consequently distances are reduced. 940-950nm IR should only be used with highly sensitive cameras fitted with high performance lenses. Focussing is also more difficult at those wavelengths as lenses start to operate more inefficiently with 940-950nm.

Besides these IR LEDs, there are some white light LED for CCTV too, they are always used to illuminate an area for the CCTV system; improve the overall level of illumination for key personnel; provide a welcoming environment for authorised personnel; and to deter crime by illuminating a secure area on intrusion; White Light can be used with monochrome, colour and day/night cameras.

When we talk about the light of LED, it always means the illuminance which is a measure of how much the incident light illuminates the surface. So some guy tell you the LED in 8 Lux is lighter than someone in 4 Lux. But there is also a the Inverse Square Law we need to notice.

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