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I need to put in a word in that one's eyesight need to be taken into account about lighting. For my self, my correction was at -14 dioptics & I have to use a 250 watt daylight lamp to read comfortably. The soft white lighting is too dim & makes me sleepy because of eye strain. The orange light on a tablet/ereader also cause a some eye strain.
I don't think that any "studies" consider what/how a person's eyesight also make a difference of reading comfortably. I do have all "daylight" bulbs in my home so I can see better.
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