OK, details please..
I've had for 2 years the idea that slowly accumulating WiFi energy would be a good way to reverse the normal trend of an emergency torch to STOP working after a while (the classic "a torch is a case with which to carry dead batteries" symptom). As LEDs use a lot less power there ought to be enough there to drive at least one simple HiBri LED..
Having said that, Maplin does a fun baby LED keyring with a crank. It's got a capacitor inside, and a few secs of cranking gives you all the light you need. You just need to change the chain - it sucks. In addition, I have this habit of bolting an emergency light near where the fuse box is - the best light is one that is there where you need it :-).
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