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On my 2014-01-18 CET flight ST2114 from FKB to LPA on a Germania airplane, cabin lights were switched from white to blue for takeoff. I recorded this in a panoramic photo.
Granted, on sunset, the sun coming in through the windows made up for a beautiful play of light: Blue and yellow are complementary colors.
Is there a security or technical reason for the blue light, or is it just for aesthetics?
Bergische Universität Wuppertal has done some research that chronobiologically-adapted LED lighting can enhance passengers well being and they can sleep better during a flight.
This article details about this research:
Adaptive solid-state lighting (SSL) scenarios in which the color and brightness of lighting is varied during long-distance overnight flights results in passengers that sleep better and are more alert upon arrival.
... at the start of an overnight flight that warm-white light helps to stimulate melatonin production and increases passenger relaxation ... blue-rich cold light in the morning increased alertness
There have been studies showing benefits of biologically effective lighting for more relaxed flights.
