In the impoverished neighborhoods in and around Manila, Philippines, millions of people live in darkness in their homes—even in the daytime. Electricity is often too expensive, and windows are a building expense that many cannot afford.
To change this, a local social entrepreneur has created a program called
A Liter of Light that illuminates the homes of underprivileged families by creating solar-powered light bulbs from a resource some may find surprising: used plastic soft drink bottles.
Volunteers for A Liter of Light begin by gathering discarded, clear plastic bottles. The volunteers then fill each bottle with water and a few drops of chlorine bleach (to retard algae growth). They then fit the bottle snugly into a custom-cut hole in the roof of a home, with the bottom of the bottle extending down into the room below. This allows the clear plastic bottle and water to refract the sun’s rays and scatter light into the house. A silicone plastic sealant applied to the roof and bottle prevents water leaks during rainy tropical weather.
On a sunny day, this simple device can produce approximately 50 watts of light in an otherwise dark room.
Because plastics are lightweight and durable, the bottle lights are easy to install and are expected to last more than five years. And the materials to produce the lights cost very little—or nothing, in the case of discarded bottles gathered by volunteers—which makes it possible for A Liter of Light to help many, many people. The program envisions installing plastic bottle lights in one million homes by the end of 2012.
In an area in which some households earn less than a dollar a day, the plastic bottle lights reduce household expenses, as well as the fire hazards associated with faulty electrical wiring and candles. And when the lights need to be replaced, the plastic bottles can be recycled and new solar lights can be installed for little or no cost.
People often find creative ways to reuse plastic products. These new uses can be practical (such as reusing a plastic grocery bag as a trash can liner), or they can be fun (like making a Halloween costume out of plastic bottles). And sometimes, they can help improve people’s lives by creating a solution to a big problem—in this case, “a sustainable lighting project which aims to bring the eco-friendly bottle bulb to low-income communities nationwide.”