"Semi-covert IR illumination typically operates at 850 nm. This wavelength produces a faint red glow that is somewhat visible to the human eye, making it 'semi-covert.'"
— Axis Communications Academy, Network Video Fundamentals, 2022
"850 nm is considered semi-covert, while 940 nm is fully covert."
— Axis OptimizedIR Guide
[References:, , Axis Communications Academy, Network Video Fundamentals, 2022 (p. 38), , Axis Web Article: OptimizedIR, ]
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