This solution looks promising, it seems to have a button which makes the light pop up.
(The Amazon cover with light for the NT 4 has a spring, but, it doesn't jump up)
It would have been great if all covers had this feature, I've used a Casio Tough Solar Wave Ceptor watch for years and it's the most reliable thing imaginable.
The excellent battery life of the kindle allready eliminates "battery angst" (as I normally get occationally with my smartphone), soutions like this could make the battery a non-issue and totally turn it into a 'it just works' reading-appliance.
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