FAQ: Why Are Infrared (IR) LEDs Visible on Most Security Cameras?

Q: Aren't infrared (IR) LEDs supposed to be invisible?
A: Infrared light is generally invisible to the human eye. However, most security cameras use IR LEDs that emit light at around 850 nm, which is close to the edge of the visible spectrum. This causes the LEDs to appear as a faint red glow, especially in low-light conditions.

Q: Why don't manufacturers use completely invisible IR LEDs?
A: Cameras can use 940 nm IR LEDs, which are virtually invisible to the human eye. However, they produce less illumination, reducing the camera's night vision range and image quality. For this reason, many manufacturers choose 850 nm LEDs for better nighttime performance.

Q: Does seeing the red glow mean the camera is recording?
A: Not necessarily. The red glow simply indicates that the camera's infrared night vision is active. Whether the camera is recording depends on its settings and operation.

Q: Can I hide the red glow from IR LEDs?
A: Only by using cameras with 940 nm "no-glow" IR LEDs or by using external infrared illuminators positioned away from the camera. Keep in mind that no-glow IR typically provides a shorter night vision range.