Circle View Camera’s Night Vision works best under the following conditions:

• Night vision is limited to 15 feet — make sure the camera is no more than 15 feet away from movement.
• The area you want to monitor is clear and unobstructed with no objects close to the camera in its field of view. The reflection of the night vision light from these objects may cause the automatic system to over-compensate, darken the image, and reduce the visibility of objects in the distance.

You can learn more about using Circle View Camera behind a window here.