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John Duffy built this Wirelessly Charging LED Light in a strong PVC Plumbing housing. It uses an inductive loop for charging which means the case can be made completely waterproof by permanently sealing the unit. Given that it is tiny and made from PVC it would be very robust. I am thinking that you could run over it with a car and it would suffer no damage. He was inspired by a Make magazine article to build his version, if you are inspired by his creation please see the design details here (PDF).
