Within submarines, two types of lighting are used; white and red, each type has special conditions. White light is used under normal conditions to facilitate movement and alertness. Red light is usually used for docking and in the control room.

Red light has special conditions to use within submarines during military maneuvers and critical situations. Have you ever wondered why the white light is replaced with red under these conditions?

Some people think that the use of red light reduces the ability to see in the dark. This saying is nothing but a big fairy tale! The opposite is true. The red light helps to adjust the vision, not only in the submarine but in airport control towers and some cinemas. Where red lighting helps the viewer adjust in the dark.

Also on the submarine, crew members need to adapt to the night vision. Red light is the longest in wavelength. The human eye is less sensitive to longer wavelengths.

Another important reason, fearing the resurgence of lighting from the submarine will make military tasks "fail". There is still an opportunity, to capture a light signal for any submarine tens of miles away, which is considered a major blow that could cause a failure of the whole process.

Therefore, red lighting reduces the chances of light emission, and at the same time, crew members can handle the instrument board of the submarine without problems.



