08/01/2013
Why Do They Turn Off Airplane Cabin Lights Before Take Off?
If you noticed or remembered, whenever you are travelling at night, before taking off, you might hear your cabin crew saying "for safety reasons, we will be dimming the cabin lights..." What's the safety reason behind it? Well, try this in your room at night. Switch off your room light and count how long your eyes need time to adjust to the darkness, so that you 'can see' your furnitures and other stuff again.
Taking a bit of theory, the rods in our eyes, which play important roles in a dark environment, can take up to 30 seconds to fully adapt from a bright environment to darkness.
That is actually one of the main reasons why cabin crew has to turn off or at least dim your airplane cabin lights before taking off in a dark evening. In case of emergency, such as aborted take off followed by overshooting the runway (crashed) and lost of electric power, passengers' eyes should be already adjusted to cabin darkness, hence they should be able to see better their airplane cabin and help them evacuating the airplane faster.
Source: http://www.jotravelguide.com/news-3.php
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