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Liter of Light is a global open source movement aiming to provide ecologically sustainable and cost-free lighting for simple dwellings with thin roofs. The device is simple: a transparent 1.5–2 L plastic bottle, as typically used for carbonated drinks, is filled with water plus a little 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 [Wikipedia]

http://www.aliteroflight.org//

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FEATURE | POSTED ON 27 MARCH 2016 | SABYASACHI, ROSHNI SEN, LITREOFLIGHT, PET BOTTLE LIGHT
Raul Aaron David, Writer
Being the change the world needs.
Eco-light shines in Kolkata's slums
The recently concluded National Conference on Climate Change 2016 witnessed many "Changemakers" who inspired the masses but if there was one who took everyone by a surprise, it was teenaged Roshni Sen, of Kolkata. Her dream to make a change? Along with her brother she's embarked on a campaign to light up the dark and dingy slums and villages in and around the city, in a unique and sustainable way.

Raul Aaron David: What or who is the inspiration behind your ‘Litre of Light’ project - Roshni?

Roshni Sen: The predicament of the poor people living in the slums of our city was the inspiration behind Project Roshni. When my brother, Sabyasachi and I realised that even with bright sunlight outside, people living in the slums need to use electric bulbs during the day, we were drawn to find a solution for them.

RAD: Being a school student, what kind of support have you got from your school, be it your principal, teachers or classmates?

RS: The Principal of my school La Martiniere for Girls, Mrs Rupkatha Sarkar has been a staunch supporter of my work. She has given wide publicity to my work not only in my school but has organized several events where I presented this simple solution to students of other schools so that they could take it up themselves and help spread “light”.

RAD: The road to success is littered with hurdles, so what were the kinds of difficulties you faced while trying to implement Project Roshni?

RS: Upon searching for information on solar light options, my brother chanced upon an initiative by MIT students in the slums of the Philippines. They filled plastic bottles with water, added bleach to ensure that algae did not grow, cut a hole through the tin roofs of the slums and partially inserted the bottles. The sunlight refracted through the bottle into the room and produced light equivalent to a 40 W – 60 W bulb. The bottles lasted five years and the light cost nothing.

We knew that we had a solution but our excitement was short-lived when we realised that instead of tin roofs in the Philippines, which could be easily cut, the slums in Kolkata had brittle earthen tiles on their roofs and that would pose problems. My brother procured a dozen tiles and any attempt to cut a hole led to the tiles disintegrating. He kept tinkering with the tiles until he arrived at a solution. Marking the diameter of a bottle’s neck on the tile, he drilled holes along the marking and cut out extracts using a power drill. The bottle could then be easily inserted into this delicately-cut hole and fixed with a sealant.

RAD: Was there a point when the obstacles ahead of you seemed impossible to get around and you just wanted to throw in the towel?

RS: Not really. The smiles on the faces of the beneficiaries have more than made up for any difficulties.









Roshni and her brother with their Litre of Light lamps - adapted for Indian/Kolkata conditions.

RAD: Other than Project Roshni, do you have any other ideas in mind right now?

RS: To work on a solution to provide solar based light at night.

RAD: What is your annual goal for Project Roshni?

RS: We wish we could take it to 10,000 bottles per year. Between us (with brother) we have so far installed 177 sets.

RAD: What would be the message you would like to get out to the girls and boys of your age group?

RS: It is a simple solution and hardly costs anything. The people living in the slums are the same set of people – drivers, maids, carpenters, electricians – who make our lives comfortable, yet they suffer silently. If each one pledges to make 10 sets, if 1,000 students like us pledge to help, we can bring light into the homes of 10,000 families in the slums.

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