I kind of think a hand-crank is going to break down less often and be much easier to repair by hand. "Whelp, the bear ate our nightlight" is not going to go over well.
but wouldn't it be better to have kids playing with a soccer ball that produces electricity all day than have them sitting around all day cranking a hand crank? Seems a little cruel...
The respective power outputs of a hand crank and this soccer ball differ by 2-3 orders of magnitude. Not to mention, only one kid gets to take the soccer ball home and light their led with it...
This is a design experiment, not a practical solution.
If you're actually trying to help the developing world, this is very low gains for a high amount of effort. Also, if you doled these out they would immediately be stolen or sold away and hoarded.
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I kind of think a hand-crank is going to break down less often and be much easier to repair by hand. "Whelp, the bear ate our nightlight" is not going to go over well.
This is a design experiment, not a practical solution.