This sounds interesting. I will have to check this out.
I don't think anyone--by which I mean me--would read 15 hours total with the light on per charge cycle unless they are mole people living in unlit tunnels or such. As the occasional nighttime wind-down while the spouse is sleeping, or as a passenger in a darkened vehicle--sure. These are the times I use my iPhone or nook/kindle with clip-on light. But this is sporadic use.
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