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IR Cameras: Halo effect in night vision mode

A halo effect is caused when infrared (IR) light from the camera's night vision LEDs are reflected back into the lens. If you have pointed your camera through a glass window, your camera image may not have a halo effect during the day. However, during low light conditions, a halo effect will appear:

Halo Effect

To prevent the halo effect from occurring, ensure that your camera is not pointing through glass or positioned near any other reflective surfaces.