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The wiki doesn't address dose, which is obviously important. I have found no data on adverse effects of light temperature in frontlit eink readers. The infamous iPad study found that two hours of reading an iPad on maximum brightness was needed to show a very modest influence on sleep.
I like an adjustable light temperature reader just because I like it (aesthetically/comfortwise), but I'm yet to be convinced that eink readers are a prominent source of damaging blue light, especially when brightness is sensibly adjusted.
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