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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Originally Posted by oj829
I'm assuming that the light coming off the Glo HD includes a fair chunk of blue spectrum, and the best thing you can do is read without it, in the daytime, with the lighting off.
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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.)