Why is night vision green?
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The original night vision / image intensifiers use something like an old TV tube.
It’s called a photo-multiplier, and it’s different to a lot of home CCTV stuff.
The cheaper night vision has an Infra red light source, and a camera that picks up infra red.
It’s almost a bit of a cheat, as it’s like having a floodlight on that a person can’t see.
The decent night vision doesn’t use any hidden lights, it just amplifies the very small amount of light available.
This is projected onto the equivalent of a tiny TV screen.
This is a tube with a thin layer of phosphorus on it, and that glows green.
It’s the same green like very old computer screens, oscilloscopes etc, the most basic form of a TV screen will be green.
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