Check out this amazing video about an organisation in the Phillipines called Isang Litrong Liwanag (A Litre of Light) - bringing light to the poor, one litre at a time. The solar bottle lights are inexpensive, made from recyclable materials and easy to assemble. They are an alternative source of daylight (up to 55 watts), powered by the sun.
To watch the video, click here
To watch the video, click here