Around the web I found how to light dark rooms without electricity using soda bottles as light
bulbs, each of the 2 liter bottles is the equivalent of a 55W lamp, your mileage may vary
depending on the lighting condition in the outside of course.
To make it you need a clean soda bottle, a few liters of distilled water and 3 teaspoons of bleach.
The distilled water is to have more clarity and the bleach won't allow the formation of fungus
inside the bottle.
The light bottles can work for as long as 5 years and they are extremely cheap.
Here you got a few pics and then a video of a Brazilian guy that uses the light bottles in his workshop.
