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Invisible IR Cameras | 940nm Infrared CCTV CamerasThe invisible IR cameras on this page use 940nm infrared LEDs so that they can not be detected by the human eye in the dark. Unlike traditional infrared surveillance cameras, which use IR LEDs that operate at an 850 nano-meter frequency, the IR LEDs in these cameras operate at a 940nm frequency and DO NOT emit a red glow. This makes them undetectable in the dark and is why they are sometimes the best choice for covert / spy video surveillance systems. Although 940nm LEDs do not illuminate quite as bright as 850nm, you can see in these video samples that they perform very well even in zero light environments.
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The following videos demonstrate the 940nm IR cameras that CCTV Camera Pros currently carries.
PIR-IR60 Day and Night Sample
DPRO-AD940 Day and Night Sample
Invisible IR Verification Test
What is a invisible IR camera?
Invisible IR cameras are typically being referred to when speaking about CCTV security cameras that use 940nm IR LEDs instead of the more traditional 850nm IR LEDs.
So, what do these numbers mean? The 940nm and 850nm reference refers to the frequency of light emitted (measured in nano-meters) by the LED lights of the camera. 940nm LEDs are invisible to the human eye. 850nm LEDs are almost invisible, except that a red glow can be seen at the location of the LED itself.
For night-time covert surveillance, this is not ideal because the red glow gives away the location of the camera. There are both indoor and outdoor camera models available on the market that use 940nm infrared.
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