This video (in Portuguese) shows how a creative Brazilian developed during a blackout in 2002, an eco friendly way to produce lightning into poor houses and warehouses in Brazil.
Using a plastic bottle, water and a little bit of any natural disinfectant* to keep bacterias away, he made a solar panel that is solving the darkness issue in a poor city of Brazil. Each bottle is equivalent a 40 watts lamp.On the top he used a plastic film container to protect the top from the sun and also sealed the bottle in the tile hole to protect from rain.
A tip to the ones that would like an eco friendly and creative alternative, where you also save money on electricity.
* Some essential oils as lavender and tea tree are powerful disinfectant with antibacterial properties. If you also want to clean you house in a greener way, you can mix 1 to 2 teaspoons of tea tree oil for a gallon of water to wash windows, floors and toilets to scrub away the germs. You can also use vinegar and lavender mixed in the water to pre wash baby clothes and kill bacterias naturally.