Electric street lamps are expensive. They are expensive to make, to maintain and to illuminate. However, cities are undoubtedly safer with them. So what to do in poorer countries?
Liter of Light, an NGO that focuses on illuminating the developing world without electricity, has figured out a way to light streets using soda bottles. In Bogota, Colombia, university students work hard to install these lights:
The lights’ beauty lies in their simplicity: A 3-watt LED lamp is connected to a controller and a battery pack, which is powered by a small solar panel. The light fixture’s protective casing is an old plastic soda bottle. Each lamp costs around 176,000 Colombian pesos ($70) to build, and nothing to run. Parts are sourced locally and the battery can power the lamp for three consecutive nights without charging. Once completed, the students install the lights throughout the neighbourhood, brightening dimly lit alleyways and dark clearings.