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Your device's screen will adjust to the time of day using the Twilight app. After sunset, it filters the blue spectrum on your phone or tablet and shields your eyes with a gentle, pleasant red filter.
Does usage of blue light filter 24×7 cause any harm to us? - Quora
What is Blue Light from Digital Devices? Is it harmful for eyes?
Blue light filters may have the opposite desired effect - Android Authority
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How to Use the f.lux Blue Light Filter App – THL SLEEP
Blue-Light Imaging Sees Through Fire - Tech Briefs
Reducing Blue Light on Your PC Screen
How to Use a Blue Light Filter on Your PC or Mac
Reducing Blue Light on Your PC Screen by Using Blue Light Filters < Tech Takes - Singapore