"Isang Litrong Liwanag (A Liter of Light), is a sustainable lighting project which aims to bring the eco-friendly Solar Bottle Bulb to disprivileged communities nationwide. Designed and developed by students from the Massachusetts Institute of Technology (MIT), the Solar Bottle Bulb is based on the principles of Appropriate Technologies – a concept that provides simple and easily replicable technologies that address basic needs in developing communities."
Amazingly innovative and quite easy to assemble, these solar-powered "light bulbs" are made of a simple combination of water and bleach. Watch the short video at the website - very cool use of recyclables without involving electricity. - LINK