User Review: Life+Gear Mini Dynamo LED Torch
Price Paid: $2.99
At 3.9 oz, this winding 3X1 3/4 inch light is as it says a DYNAMO! No batteries to replace. I use it when I hear that thump thump, or have a call of nature in the middle of the night.
So a short wind and you are good for the night. Works as well as anything I have ever carried.