Gravity is simpler (no spring, no ratchet winder), cheaper and more reliable. And you can adjust the weight to adjust the brightness and duration of the light.
As a retired engineer I have to say the idea is simply brilliant!
It could be scaled up to generate more power. I'd like one to power lights and TV.
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Probably so___springs and wind up gens aren't too reliable. I was thinking of incorporating some kind of joule robber type circuit like I posted about here
I'll bet in part that is how it works. I do understand about keeping cost down but just wonder how long that thing will last. Interesting though.
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