940nm wavelength is located in the infrared lights spectral range, invisible to the naked eye. 940nm invisible infrared technology is widely utilized in applications such as night vision devices, remote controls, security cameras, and other applications to provide clear night vision while maintaining surveillance invisibility. The 940nm IR light has a good transmission capacity in the atmosphere, which makes it suitable for long-distance transmission and telephoto shooting.
940nm vs 850nm night vision
Both 940nm and 850nm near infrared light are invisible and both can be used in night vision systems. The difference is that 940nm is almost completely invisible to the naked eye and cell phone cameras, therefore 940nm is better suited for surveillance scenarios where concealment is required.
The radiation intensity of 850nm is about 2-3 times higher than that of 940nm, so 850nm infrared light will be a bit brighter. Therefore, 850nm will have a red burst situation, LED chip will appear visible red dot in the work, 940nm is not have. This can be a disadvantage in infrared lighting applications, but in some cases this visibility can help to confirm the operational status of the IR led strip.
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