British design firm, Therefore, has designed a $5 light for use in the developing world.
It’s called GravityLight, and the design couldn’t be simpler.
Co-creator, Jim Reeves, explains how it works…
“The product consists of the generator ambient light unit. It’s shipped in a very robust bag that takes ballast. You take it out of its bag, you fill this bag with gravel – whether that be aggregate, sand, soil. You attach the bag, you hang the product. And when you lift the bag, then you have your light source.”
GravityLight can produce up to half an hour of low-level lighting. Not great. But it’s a massive improvement over dangerous kerosene lamps currently in use throughout developing countries.