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Liter of Light

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Anoush Jakeman

on 4 June 2014

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Transcript of Liter of Light

What is a "Liter of Light"?
Created in 2002 by Brazilian mechanic, Alfredo Moser.
What are the benefits?
A "Liter of Light" is a solar lamp.

It is nothing more than a
plastic bottle
filled with
and a tiny bit of
, which is installed in the roofs of informal houses and provides a free source of indoor light.

The liquid inside the bottle uses the light from the sun,
diffracting the light
to all parts of the room.

It is equivalent to a 55 Watt light bulb.

A special glue is used to seal the bottle to the roof, so it does not leak when it rains.

The average life time of a solar lamp is
estimated to be 4 to 5 years.
The idea came to him during one of the frequent electricity cuts. He came up with a way of illuminating his house during the day without electricity.
The Story
Energy saving
Zero carbon emissions
Made from waste
The plastic bottles are upcycled in the local community, so no energy is needed to gather, shred, manufacture and ship new bottles.

The carbon footprint of the manufacture of one incandescent bulb is 0.45 kg CO2.

A 50 Watt light bulb running for 14 hours a day for a year has a carbon footprint of nearly 200kg CO2.

The solar lamp emits no CO2.

Source: UN
Energy Savings
How it works:
the science

Refraction is the bending of light which is caused by a change in its speed.

The speed of light is determined by the density of the substance through which it passes.

So refraction occurs when light passes from one substance to another with a different density - e.g. from air to water.

In the case of the solar lamp, the sunlight is bent by the bottle of water and spread around the room.
Next steps
How do we make a Liter of Light?

What materials and tools do we need?

What steps do we need to follow to make a Liter of Light?
The first project
The aim of the MyShelter foundation is to illuminate over 1 million homes around the world by 2015.
Gives poor families access to a free source of light.
Saving in disposable income could result in more funds for nutrition, school expenses, etc.
Accessible to everybody.
Creates jobs for local entrepreneurs - they build and install the light bulbs.
It works by the refraction of sunlight.
6 trees are needed to offset 1 ton of CO2 after 10 years!
Then, a charity in the Philippines called MyShelter that builds houses using sustainable and recyclable materials, started making and installing the lamps. Then they trained local people to create and install them.
In 2011, students from the Massachusetts Institute of Technology (MIT) developed the design of a Liter of Light, based on the concept of
"Appropriate Technologies"
- a concept that provides simple and easily replicable technologies to communities in need.
Today, over 28,000 solar lamps have been installed in the capital, Manila, alone.
The idea has spread to around 20 countries, from India and Bangladesh, to Tanzania and Fiji.
Full transcript