Very clever! I'll state for the purposes of prior art that, if you can get enough power to add a little fan or other air-moving mechanism to the circuit to pul

Very clever! I'll state for the purposes of prior art that, if you can get enough power to add a little fan or other air-moving mechanism to the circuit to pull air through the tube/heatsink, it will operate in still air for as long as a human can keep it warm. This opens the mind to a realm of interesting body-powered devices, especially in environments where heat sinking is easy, like for divers, motorcycle riders, and sailors. Want a wetsuit or jacket that lights up or operates sensors on its own? Easy peasy.