#gravity powered

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GravityLight: lighting for the developing countries from Therefore on Vimeo.

We don’t even think about what we would do if we didn’t have light. Flip a switch or press a button and there is immediately illumination. In places where there is not electrical wiring already in place, you usually have to resort to fire, solar options, or hope that you have a battery that will last you long enough to get to another charging station. Now try to imagine what ... http://dlvr.it/B88hV1

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The creators of a light powered purely by gravity hope it will provide an alternative to toxic kerosene in the developing world. Almost a fifth of the world's population has no access to electricity so have to use other means to heat and light their homes - which are often expensive, dangerous and unhealthy. But the team at Deciwatt have created the Gravity Light, which they hope will get millions of people in the developing world away from kerosene and out of the poverty-fuel trap. Kerosene consumes between 10% and 20% of the income of the very poor and a single kerosene lamp burning for four hours a day emits 100kg of carbon dioxide a year. Quaqua installs the trial Gravity Light in his home in Liberia The World Bank estimates 780 million women and children breathe kerosene fumes equivalent to inhaling 40 cigarettes a day and these fumes kill an estimated 1.5 million in Africa every year. Deciwatt was asked by the charity, Solar Aid, to develop a viable alternative to kerosene lanterns for under $10 (£6). "We found very quickly that the target price that they wanted to achieve was impractical based on current technology with solar panels and batteries combined," says Jim Reeves, who developed Gravity Light with fellow designer Martin Riddiford. "It got us thinking about how to tackle the problem in a way that could achieve the objective within the target price." Janitor Lorenzo Garneo fills a Gravity Light bag in Liberia Wind-up lights can take two or three minutes to charge but Gravity Light takes three seconds to lift for 30 minutes of light. It uses a mechanism similar to a grandfather-clock. A bag is filled with 10kg of material, found in the local environment. This could be soil, rocks or rubble. The bag is suspended from a riveted plastic cord which is suspended below the light. Once the bag is lifted, a series of gears turn powering a plastic generator, which turns the light on. The generator can be used to recharge other devices including radios and batteries. Through a successful fundraising campaign, a prototype of Gravity Light is now being trialled in 26 countries through 55 partner organisations. Mr Reeves says the product has taken more than four years to get to this stage and had many iterations - but that the feedback from the user trials was essential. A young girl helps one of the village elders construct Gravity Light "We've had amazing feedback from Liberia, the Philippines, Guatemala," he said. "They're just the first indication. In essence the product is delivering what people need." Lorenzo Garneo, head janitor at Our School, Liberia voluntarily broke a panel in his false ceiling to install the light. He struggled at first with the hooks but was particularly excited at the prospect of having light for his children's room. There are seven in his household. Taking the product to scale and making it affordable is one of the many challenges the company now faces. "They need to figure out a service package that will get this in the hands of the target users and allow them to pay for it over a period of time," says Rob Law, the founder of Trunki, the children's luggage firm which has grown across the world. Lorenzo Garneo installs Gravity Light in his children's bedroom in Liberia Gravity Light say they are looking in the medium term at introducing in-country assembly and then ultimately in-country manufacture, which would strip out import duties. "The end cost for the user will be reduced and you can build a local supply chain that is built on a local business, which is all good for the local economy," says Mr Reeves. To achieve the target retail price of between $5 (£3) and $10 (£6), the team is planning to launch Gravity Light in both high-income and low-income economies in parallel. They will then use profits and donations from the high-income markets to initially subsidise distribution and associated costs in low income markets. For now, the main focus for the team is raising investment and seeking partners to move the project forward, in order to achieve their goal of bringing safe and efficient light to the developing world.