b. Solar Bottle Lights in the Philippines


CCTV-9 Report
2011, 3 min 15 sec

Thousands of poor homes in Manila have a problem, not uncommon for cramped and small settlements. These houses are so close together, with metal roofing that all the light is blocked off and no light reaches the homes even during daylight!

The solar bottle bulb, an innovation developed by students of the Massachusetts Institute of Technology, inspired by the Appropriate Technologies Collaborative,
is helping poor communities in developing countries like Brazil and Philippines through simple and appropriate innovation.

It is a simple bottle bulb, usually a 1 liter soda bottle that is filled with a solution of purified water and bleach. The bottle is inserted halfway through a hole drilled in the metal roof and its sides are sealed. The whole deal looks like a bulb through a sunroof and provides a good amount of light by deflecting sunlight into gloomy interiors. The chlorine and bleach ‘poisons’ the water to keep molds from developing so the solution can last up to five years. The clear and purified water helps disperse the light through refraction, so the light is not concentrated. It only costs $2-3 to make a solar bottle bulb that is bringing light to dark homes.

This simple innovation is not perfect- the water needs to be replaced every five years and obviously without any provision for energy storage, the bulb will not work at night. But the advantages are overwhelming for communities that are deprived of daylight. It is surprisingly effective, using cheap and locally available materials that allows the poor in these settlements to use their homes more effectively. The bulb does not produce any harmful pollutants and also reduces the dangers from faulty and temporary electrical connections that cause devastating fires.

Per the Philippine Daily Inquirer, the idea is actively being promoted by MyShelter Foundation Inc. in the Philippines under its Isan Litrong Liwanag Project which means A Liter of Light and it was launched in San Pedro, Laguna province early this year. Isang Litrong Liwanag is a Philippines-based organization aiming to build indoor lighting in one million homes throughout the country by 2012. The Manila City government shouldered the expenses for making the bulbs while MyShelter Foundation trained residents on how to make them.

Associations like the Appropriate Technology Collaborative create new sustainable technologies that promote economic growth and improve the quality of life for low-income people worldwide. This project and its success is a great example of the ‘market-based’ solutions that should be pursued for socio-economic problems worldwide, strategies that are smart, effective & resourceful.