Is 940nm visible?
Is 940nm visible? 940nm is further from the visible spectrum and is much more difficult to see the source at night. 850nm is closer to the visible spectrum, and it's much easier to see a dull red glow in darkness. Also the sensitivity of most security cameras generally falls off from 850 nm to 940nm very quickly. What is the difference between 850nm and 940nm IR? All cameras are most sensitive to 850nm infra-red, delivering superior surveillance footage at night. 940nm delivers virtually invisible covert lighting but does result in reduced performance (typically up to 40% less) and requires a...