A Liter of Light is what you get when you take a 1.5 – 2liter recycled plastic bottle (PET bottle), fill it with distilled water and 10ml of bleach to prevent algae growth. Using contact cement, that bottle of water is easily installed in makeshift wood or tin roofs found in marginalized communities around the world. Sunlight, refracted by the water provides 100% passive solar light, equivalent to a 55-watt light bulb for homes with limited or no access to electricity.
Liter of Light is an open source movement. You can easily build your Daylight bottle right at home. Check out the videos below for step-by-step instructions.