Liter of Light aims to provide an ecologically and economically sustainable source of light to underprivileged communities around the world. This source of light is based on a solar bottle, easy to install and requires only simple technology and accessible materials. In detail: You take a plastic bottle, fill it with water and some chlorine to keep the water clean, and then make a hole in the roof of the household & install the bottle - half outside half inside. The daylight that enters from above gets diffracted by the water and spreads the light into the room. During the day, it substitutes a 55 watt light bulb completely. Our solution also works when the sky is clouded. There is still enough light getting inside the bottle, but of course the bottle will shine less brightly.
The impact of installing these solar bulbs goes beyond providing light. It will lead to a better quality of life for the families, create new working opportunities and will reduce the carbon dioxide footprint.
The main problem we are trying to solve is the lack of light inside people’s homes. The shelters are mostly built so close one to another, that even rooms with windows lack sunlight.
Without a source of light, it is impossible to see accurately and thus performing basic tasks becomes very difficult. The beauty of our idea is that it is simple enough for everybody to learn how to build it. That’s why it can also create jobs for people in the slums. In Bangladesh a micro entrepreneurship model has successfully been tested and implemented and we are currently working on initiating the same concept in our latest projects in Kenya and in South Africa.
Besides, people trying to receive electricity illegally are exposing themselves to life-threatening risks, such as a fire due to an electrical short. Families again, which have access to electricity pay substantial amounts to their electricity supplier rather than satisfying other more pressing needs.
There are 2 categories of costs:
- Bottle installation costs (0.09 – 5.36 € per bottle)
- Project costs to establish new organizations (around 6,000 €)
Bottle installation cost:
The cost for the material varies in each country. As the glue is sponsored by SIKA (a swiss glue producer), the costs can be reduced by approximately 59 %.
Almost all materials can be found on spot during the installation. That’s why after an initial investment in the required tools, the installation of a bottle is nearly free.
- New projects last for around two weeks, during which a team of three members of Liter of Light set up a new organization, helping with the recruitment, the organizational set up, creating awareness, etc.
- flights (3,600 €)
- material & tools (1,200 €)
- transportation (600 €)
- accommodation (550 €)
- communication (50 €)
Stage of development: Produced in serial production
- Our primary objective is to support Liter of Light initiatives around the world to illuminate underprivileged households
- Origin in the Philippines
- Organisations in at least 15 countries
- 1000 solar bulbs will safe 20 tons of CO2
- One bottle equals a 55 watt light bulb
- environmental and social benefits
Organization: Liter of Light - Switzerland
Contact: Peter Freudenstein
Used by: Philippines, Vietnam, Bangladesh, India, Egypt, Kenya, Tanzania, Uganda, Zambia, etc.
Housing & Construction
Waste Management & Recycling