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This is the lightest cheapest bicycle light I'm aware of. Furthermore, it does not take away pedalling energy and it´s quite aerodynamic.

I know that it is not very impressive, but I think it is really useful.

Step 1: Materials:

A pocket solar torch, avaliable in ebay for 2 €
A piece of inner tube or rubberband

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More by m a r i a n o:simple rowing bicycle "la remarianette" Easy wheel lacing solar bicycle light "la aladina" 
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