Liter of Light
| Type | Social enterprise, Interest group |
|---|---|
| Location |
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| Services | Affordable and sustainable light |
Key people |
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| Website | literoflight |
Liter of Light is an open source design for a low-cost light tube (or deck prism or vault light) that refracts solar light to provide daytime interior lighting for dwellings with thin rooves. Daylighting is cheaper than using indoor electric lights during the day. The device is constructed simply, using a transparent two-liter bottle filled with water and a small amount of bleach to inhibit algal growth, and fitted into a hole in a roof. The device functions like a deck prism: during daytime the water inside the bottle refracts sunlight, delivering about as much light as a 40–60 watt incandescent bulb to the interior. A properly installed solar bottle can last up to 5 years.