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Originally Posted by SteveEisenberg
That's because the "light output" reflected back from a newspaper, paper book, or conventional eInk screen, in typical real-life scenarios, "is not even close" to that of a backlit device.
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-in real life situations there is not many that will think a full brightness iPad is okay to read from in the low light environment. But to each their own.
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Please quote where in the study they wrote that it is "intended to investigate the effect of different light spectra on circadian rhythm"? I missed that. However, previous research footnoted does show there is such an effect.
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They stress that the peak at 420 causes the melotin reduced production and how the peak at 620 of normal light bulb doesn't do that. You are hardpressed, in their light output table to see the so called peak at 620 - it is so small, it might not even exist.