The human eye is less sensitive to longer wavelengths, so red light is chosen to preserve the night vision of the crew while still allowing them to still see their instrument panels. Submarines switch to red light when it's dark outside and crew members need to use the periscope or go on watch duty.
Night lighting — Where the ship dims the lights, or switches to red or blue lights, to help naval officers adjust to darker conditions and maintain healthy circadian rhythms.
Red LED globes are used for low light situations during combat. Red light requires less adjustment by your eyes when coming from a completely dark area.
Red light helps for when you are submerged or at night (adaptation to night vision) Blue light = silent running.
The red light indicates a vessel's port (left) side; the green indicates a vessel's starboard (right) side. Sternlight: This white light is seen only from behind or nearly behind the vessel.
Used in submarines, to ensure all interior lighting is red and of low intensity so as to preserve night vision. See "Darken Ship". View another term?
Military submarines travel underwater in an environment of total darkness with neither windows nor lights.
The showers on a submarine are set up much like the ones in your home, well kind of. They have hot and cold water access with a recirculation pump so that the water stays hot so that you can use it quickly and efficiently by minimising water usage. Reducing water usage is a constant major driver for submariners.
Everybody is aware that smoking is a legal, if harmful, stress reliever. So the Navy banned smoking aboard submarines not with the stated purpose of curing the smokers, but of protecting nonsmoking submarine crew members from the threat of heart and lung disease from secondhand smoke.
It turns out that some submarines use red interior lights for the same reason as airport control towers (at night), planetariums, and some movie theaters. The reason is that it's easier for your eyes to adjust from red light to dark than from white light to dark.
Nearly all submarines are fitted with an amber quick-flashing light situated above or abaft the main steaming light. This additional light is for use as an aid to identification in narrow waters and areas of dense traffic.
From the above discussion, it is clear that the primary reason is to preserve night vision. The red light emitted from these flashlights allows military personnel to see in the dark without compromising their ability to see in low-light conditions.
Neil Jacobs, a weather modeling expert, gave the most likely explanation, which is itself a pretty strange thing. “They were commercial fishing vessels that were fishing for Pacific saury using very bright red arrays of LED lights,” he said.
If a vessel is crossing your path, the colour of its sidelight shows you which direction it's travelling: red sidelight – crossing your path from your starboard (right) side to your port (left) side. green sidelight – crossing your path from your port (left) side to your starboard (right) side.
Port traffic signal lights
The flashing red lights can also be used to advise of a serious emergency or to divert small ships according to instructions. A Harbour Master's Notice with a Notice to Mariners will be issued for areas where the port traffic signal areas are used.
We use blue light for underwater fluorescence for the simple reason that it is better than ultraviolet light (black light) for this application.
If the night is dark, consider turning on the red lighting inside your uboat. Such lighting makes it easier for the eyes to adapt to the darkness. It will increase the sight range of your crew and will also make your screen brighter.
Red is for night time. Improves surface visibility (not 100% sure). Blue is for silent running. Oxygen consumption is reduced.
RED—A red signal light means STOP. A right turn can be made against a red light ONLY after you stop and yield to pedestrians and vehicles in your path.
Since the color red has the highest wavelength of all the colors we can see it scattered the least. So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc.
But green light penetrates a little better, and shows more detail. It may be preferred for distance vision, and for close up clarity, such as reading instruments or maps. Green is more commonly used in military situations, where it is claimed to be less detectable by night vision equipment.
Submarines are painted black to help them hide, as it is essential for submarines to hide while doing their job. The black color has proven to best help the submarine hide in the ocean.
Because black reflects the least amount of light and therefore camouflages it the best when it is surfaced, partially submerged, or near the surface. Generally, most of the submarines are painted full black.
Submarines are painted black primarily because the color creates an effective camouflage against enemy submarines, ships and aircraft. Black submarines are very difficult to spot in the vastness of an ocean, especially at night.
Amine fills the air
You are probably wondering why I would call this post such thing... Since Submarines remain submerged with a sealed atmosphere they rely on a chemical called Amine to remove the carbon dioxide. This chemical makes everything stink.