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The red light on subs is there to make it easier on your eyes to adjust to the dark and help with your night vision for looking through the periscope at night.
by close04 8y ago
The red light on subs is there to make it easier on your eyes to adjust to the dark and help with your night vision for looking through the periscope at night.
The reason is your night vision relies on rhodopsin, a compound very sensitive to light but not red light. So red light will give you night vision using the cone cells instead of consuming the rhodopsin in the rods of your retina.
- thomasfortes 8y agoWhich is the same reason why astronomers use red lights when using telescopes and most of astronomy related software have modes where the screen have a red filter all over it.