In movies I always see that in a submarine or a military tank they turn on a red light when there is an alarm. Why are they turning on this red light. There are no windows in a tank or a submarine, and you can still see better with normal, white light.
Answer
Bye Ralph
Your question has to do with the following: our eyes need a certain adjustment time to adapt to more or less extreme lighting conditions. For example, if you step into a dark room from strong sunlight, it will take some time for your eyes to adjust to that minimal illuminance. And the reverse is also true: if you step from a more or less dark room into a brightly lit environment, you are blinded for the first few minutes. The operator of a vehicle or vessel operating in the dark must be able to see clearly in the dark. If you now just turn on the light inside, for example to consult a map, the driver will initially be blinded. If it is still necessary to make light indoors, red light will be chosen. Then you still see something and the effect of the glare afterwards remains minimal.
I myself have no experience with submarines or tanks. But also on board sailing yachts that sail at night, for example, only red light is used on board!
Answered by
Tony Vandenborn
electronics, telecommunications
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