Infrared cameras are sometimes referred to as night vision cameras because of their ability to capture objects in complete darkness. Humans aren't able to see infrared light because it lies in a different range of the electromagnetic spectrum than visible light, which is discernible to the human eye. Infrared cameras operate using infrared LED lighting installed on the outside lens of the camera. This allows the camera to capture and record images in the absence of regular lighting. If the area is slightly lit, the image is clear as if it were daytime and the picture is captured in color. In complete darkness, images appear in black and white. All objects that have a temperature register in the infrared. Special thermal infrared cameras are often employed by the military to detect insurgents or enemy combatants from a distance.