Drift TV
Credit: Saffron/Ars Technica
Blue sky gives a blue cast to everything in daylight. Before humans learned to control fire, light after sunset was typically very dim – moonlight or starlight. Fire gave humans relatively bright light after sunset, but it still differed from daylight in having a red-yellow cast. First open fires, & later candles, oil lamps, kerosene lamps & incandescent electric light all have a red-yellow cast.
More recently, fluorescent & LED lighting has exposed us to light with a blue cast after sunset. TV, computer, phone & other screens, usually have a blue cast too.
There is evidence that these blue lights after sunset can have negative consequences for human health1,2.
If most of your evening screen exposure is to a device with a HDMI interface, help may be at hand in the form of the Drift TV.
http://arstechnica.com/gadgets/2015/11/drift-box-reduces-blue-light-emitted-by-your-tv-might-help-you-sleep-better-2/
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1 “Is blue light keeping you up at night? We ask the experts”, http://www.digitaltrends.com/mobile/does-blue-light-ruin-sleep-we-ask-an-expert/
2 “Blue light has a dark side”, http://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
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