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An infrared security camera has infrared LED lighting (light from a different region of the electromagnetic spectrum than we normally use to see) installed around the outside of the lens of the camera. This lighting allows the camera to capture a good image in no light at all. With a little bit of light (called low light) the infrared camera can capture a picture that looks just like daytime. People use infrared security cameras for businesses that have the lights out at night (in case of break-ins). Or for outside, nighttime viewing. Keep in mind that even at nightime there is a normally some light from the moon, stars, or street lights.
Infrared security cameras will provide a color picture while the light is good. When it gets dark, the camera will switch to infrared mode and illuminate it's built-in infrared LEDs. In infrared mode the image is captured in black and white - this is true of all infrared cameras. The level of light required to capture a good picture is referred to as a camera's lux, the lower the lux the better the camera can see in low light. For example a camera with 0.003 lux is better than a camera with 0.2 lux. Infrared cameras are considered to be 0.0 lux in infrared mode - in other words they can 'see' with no light at all.
Infrared cameras are also compared by how far they can see in total darkness. This is generally a result of how many infrared LEDs are built into the camera.
