If we’ve followed the principle correctly it seems that you turn the timer and as it unwinds the energy from the movement – that’ll be the kinetic energy – is transferred to illuminate the LED – presumably electric energy. Plus obvuiously a little heat, just to keep the physicists happy and the equations balanced.
In other reports there is talk that the stored energy – so the potential energy – powers the LED. We like that argument a lot less being as we are strong believers in the theory that potential energy is just a cheap get out clause for physicists to explain why there experiments don’t work.
Regardless of the physics behind the lamp, the idea is genius.
You wind it up to the length of time you require illumination for and off it goes. When the time is up the light goes out.
Wonderful for dozing off to, reminding you to take your cake out the oven, or just illuminating the corner of a room.