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When operators talk about "red night vision," they are usually referring to the use of red lights and red filters to preserve the eye's natural dark adaption. Human eyes contain rod cells responsible for color vision and cone cells responsible for low-light vision. Cone cells are most sensitive to green and blue wavelengths and least sensitive to red wavelengths, which is why red lights have minimal effect on the rhodopsin (visual purple) that gives night-adapted eyes their sensitivity to low light levels.
For night vision device users, this matters in two ways. First, when using a flashlight, red filters or red LEDs let you read maps, check gear, or perform tasks without burning out the dark adaption you need to operate effectively without your night vision device. Second, all night vision monoculars and goggles have brightness controls that can be set very low; pairing low-brightness NVG operation with red light task illumination preserves your ability to switch between aided and unaided night vision quickly.
If you are building out a night vision setup for the first time, plan on adding a red-light-capable flashlight or headlamp to your kit. The PVS-14, PVS-31A, and other Gen 3 night vision optics in our catalog all benefit from a workflow that respects how the human eye adapts to varying light levels.
Want a deeper technical reference? Read our free Night Vision Generations Reference Guide covering Gen 2 vs Gen 3, image intensifier tubes, FOM, SNR, and how to read a tube datasheet.
