Red light in command room? - Why in sub's??

[robse]

[color=#000000]Hi.

After watching a lot of sub movies, I've noticed the red light that replaces the normal white light, when the sub is in a war-time action.

Is it]

[chips]

Red light makes it easier

Red light makes it easier for the eye to adapt to night vision. The time it takes for each person to get their night vision varies.

Think about a night submerged attack. With white lights on in the control room, no body has their night vision; with red lights, every body has night vision.

Second reason I doubt this, is the fact that the scope is only up for a few seconds, AND someone has his eyes glued to the inside end, blocking the lenses.

With white lights, the scope has to be up longer, for the operators eyes to get their night vison - increasing the chance the scope wake will be spotted. With red lights, no eye adjustment period is needed.