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Originally Posted by GeoffR
For sleeping the best light is no light at all. But for reading I find a cool (blue) light more comfortable than a warm (yellow) tone. Natural sunlight is quite blue and is great for reading.
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My Glo and Glo HD are my all-around feel-easiest-on-the-eyes-and-wrists bedtime book solutions. I wasn't even toying with shelling out for a KA1 (size and weight!), so I may just finally clip those $10 blue-light-blockers from Amazon to my bedside reading glasses to see what happens on a Glo.
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Actually I think you'll find that the frontlight in all e-ink readers has less blue than natural sunlight. I have an early model Glo which I gather has a bluer light than the current models, yet with the frontlight on (bright enough to see) in daylight it looks slightly yellower than it does with the frontlight off, which indicates that sunlight is bluer than the frontlight LEDs. (Indoor lighting at night it is the opposite, the Glo looks a little bluer with the frontlight on than with it off.)
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Thanks for the insight. I've held onto my Glo. I actually prefer it under room-light conditions versus the Glo HD. I've toyed with fonts and sharpening and whatnot, but with the frontlight off, it's just an easier read (to me).
Thank you both. I really should have grabbed a clue on my own that e-ink screens were opaque.