I saw this on dornob.com and it got me interested. This is a low tech way to make your own solar lights using recycled coke bottles. This quick and easy project should yield a 55 watt light for you.
Who says you can’t bottle (and distribute) genius? Developed in Brazil to address under-illuminated slums, this simple design idea has been adopted by MIT students and expanded to other developing areas where many low-income homes lack access to either daylight or electricity
I am planning on introducing this to my greenhouse and maybe some other buildings as it will free me up some form the grid and lessen my carbon footprint.