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Hub Dynamo – built inside the wheel hub (more modern but still mechanical).
Pros of the old dynamo lights
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No batteries needed
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Works whenever the bike moves
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Durable and simple
Cons
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Light becomes dim when riding slowly
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Adds a little resistance while pedaling
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Can slip in rain if it touches the tire
These generators were very common on bikes in Europe and older bicycles around the world.
If you want, I can also show you pictures of old bicycle dynamos or how to connect one to modern LED lights.
