Turning gravity into energy is not something new. In fact, if you have ever wondered how the clock tower of London is working without battery then Gravity is the answer we’re looking for. Gravity has been the source of energy to make the clock work. Gravity as we know pulls all objects downward which produces a kinetic energy. A machine can be used to absorb the kinetic energy thus converting it to mechanical energy and then can be transformed to electrical energy that is powerful enough to produce light from a bulb.
The video above demonstrate gravity lighting up a bulb. In order for the device to work, it has to use potential energy produced by the gravity. Inside the device, is a machine that is built in the most effective and efficient manner to absorb the energy produced from gravity and transform it to electrical energy. A machine that produces the electrical energy can be done in different ways because electrical energy can be produced either through friction, heat, light, chemicals, pressure, or magnetism. Although the video above does not entirely explain how it works on the inside but most probably a combination of any of the stated sources of electrical energy (probably because it is a secret or patented). However, having the device as cheap as $5.00 it could be possible that the machine uses gears and copper materials to produce friction (cheapest source of electrical energy).
Nevertheless, all these produced electrical energy goes through a light bulb. What makes the light bulb glow is the tungsten filament material. A filament is thin electric conductor wire that can easily heat up and glows. Once it glows, it then produces light.