LED – David South Consulting

By David South, Development Challenges, South-South Solutions

Developments in India are showing the way forward for low-cost solar power for the poor. The Duron Solar Home Power System (http://www.duronenergy.com/product_info/) is now enabling the rural poor to generate and store solar electricity. It is powerful enough to charge gadgets and appliances and run LED lights. It allows people to do their household chores into the dark hours and to study or earn extra income.

As the company says, it “allows ample light for cooking, for children to study at night, and for shop owners to stay open later to earn more money.”

The system removes the need for polluting and dangerous kerosene lamps, which are used by an estimated one million families for lighting in India.

Kerosene lamps are a major contributor to indoor air pollution, which itself claims the lives of 1.5 million people each year. Kerosene lamps have also caused countless deaths by suffocation, burns and fatal fires.

The United Nations Environment Program says kerosene fumes are responsible for around 64 percent of deaths for children under the age of five in developing countries.

More than 1.7 billion people around the world have no domestic electricity supply, of whom more than 500 million live in sub-Saharan Africa (World Bank). Some 400 million people in India do not have access to electricity, according to the World Bank, and 600,000 villages lack an electrical supply. Prime Minister Manmohan Singh has pledged “power for all” by 2012. Without electricity, many development goals remain dreams that will never be achieved.

Being able to see at night unleashes a vast range of possibilities, but for the very poor lighting is often the most expensive household expense, soaking up 10 to 15 percent of income.

According to Greenpeace (http://www.greenpeace.org/international/), India could generate 10 percent of its electricity from solar power by 2030.

The Duron package comes with a five watt solar panel, a cell phone charger connection, three LED (http://en.wikipedia.org/wiki/LED_lamp) lights, and an AC grid charger. After a day of charging, the Duron can power three hours of bright lighting or 10 hours of dim lighting.

The Duron system sells for about 5,999 rupees, or around US $130, and the typical user to date has been small businesses and schools.

Duron is selling several thousand units a month and the company is currently scaling up its sales efforts.

Duron’s approach is to provide a market solution to the huge problem of providing electricity to India’s rural poor.

The company was launched in 2008 with the goal of providing electricity to those without around the world. It was developed out of the Idea Lab (http://www.idealab.com/), a Pasadena, Californian incubator of technology companies.

Extensive field research was conducted across India to determine what was the best solution and what were the needs of rural dwellers. Duron moved its headquarters to Bangalore, India in 2009 to be closer to its customers and expand sales. The company operates in the Indian states of Uttar Pradesh and Karnataka.

By August 2009, more than 2,100 people had light because of the Duron system. The company calculates this translated into 172,500 hours of light.

One customer, Anil Singh, lives with his family in the unelectrified village of Narainpur. His family used kerosene lamps and was paying US $4 a day for unreliable lighting. But after seeing his neighbour, Santosh Singh, with bright, powerful lights at his home, he was curious as to why. When he found out about Duron’s system, he installed a system to light his front porch and two rooms in his house. His family now enjoys two-and-half hours of reliable light in the evening to do things.

“The Duron has made my life so much easier,” said Anil. “It’s a much cheaper (lighting) option compared to kerosene lamps, and I now have a reliable source of power on a daily basis,” he told the company’s website.

Another innovative start-up with offices in India and Africa, is the d.light company, which also has a new, highly-efficient solar-powered product available. The Kiran LED lamp (http://www.dlightdesign.com/products_kiran_global.php) stays lit for eight hours on a full battery and is four times brighter than a kerosene lamp. It illuminates 360 degrees and produces an even, bright white light.

Published: February 2010

Resources

1) Lighting Africa: this website run by the World Bank is a virtual business community and has forums, market intelligence, access to grants, network and partnership opportunities. Website: http://lightingafrica.org/index.cfm?Page=Home

2) D.light Design is dedicated to bringing modern lighting and power to more than 1.6 billion people globally currently living without electricity. They aim to be the number one player in off-grid lighting and power solutions worldwide. Website: http://www.dlightdesign.com/

3) Solar Power Answers is a one-stop-shop for everything to do with solar power. It has a design manual and guides to the complex world of solar power equipment. Website: http://www.solar-power-answers.co.uk/index.php

4) Sun King solar lantern: The lantern provides 16 hours of light for a day’s charge. Website: http://www.greenlightplanet.com/ourusers.html

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP’s South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South’s innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.

This work is licensed under a
Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

ORCID iD: https://orcid.org/0000-0001-5311-1052.

© David South Consulting 2022

Cheap Paper Microscope to Boost Fight Against Diseases

By David South, Development Challenges, South-South Solutions

SOUTH-SOUTH CASE STUDY

To tackle diseases in the developing world, the most important first step is diagnosis. Without effective diagnosis, it is difficult to go to the next steps of either treatment or cure. While much attention is given to the high costs involved in treating and curing ailments, screening for diagnosis is also expensive, especially if it involves lots of people. Anything that can reduce the cost of diagnosis will free up resources to expand the number of people who can be checked, and help eradicate contagious diseases.

One innovation is an inexpensive microscope that could allow diagnosing diseases such as malaria to be done on a much larger scale. Called the Foldscope (foldscope.com), it is made from paper, comes in a variety of bright colors and resembles the cardboard, three-dimensional cut-and-keep models regularly found in children’s books and magazines.

Foldscope’s designs are developed on a computer and then printed. Foldscopes are made from thick paper, glue, a switch, a battery and a light-emitting diode (LED) (http://en.wikipedia.org/wiki/Light-emitting_diode).

Inspired by the ancient Japanese paper-folding craft of Origami (http://en.wikipedia.org/wiki/Origami), Foldscope’s makers at the Prakash Lab at Stanford University (http://www.stanford.edu/~manup/) are trying to create “scientific tools that can scale up to match problems in global health and science education”, according to their website.

The Foldscope can be put together in less than 10 minutes (http://www.youtube.com/watch?v=rphTSmb-Ux4) using a pair of scissors, packing tape and tweezers.

Once assembled, a user places a standard glass microscope slide in the Foldscope, turns on the LED light and uses their thumbs to guide the lens to view the slide.

Each Foldscope can magnify up to 2000 times with a sub-micron resolution of 800 nm. The battery can last up to 50 hours on a single button-cell battery and requires no further external power. Its makers claim it can survive being stepped on or dropped from a three-storey building.
It can perform a wide variety of microscopy techniques.

Its makers hope to manufacture billions of Foldscopes a year by exploiting the cheapness of the material and the simplicity of construction.

A beta test called “Ten Thousand Microscopes” will enlist 10,000 people to test the Foldscope in the field. Participants will contribute to helping write a field manual for the Foldscope prior to mass manufacturing. The Foldscope costs just US $0.50 to make for the basic model and US $1 for a higher-magnification version.

Field tests are taking place in the United States, Uganda and India.

Foldscope is designed to be used where more sophisticated lab analysis is not possible or affordable. It can also be an educational tool to give students experience in hands-on microscopy, or build awareness in the general population of how infectious diseases are spread by unseen lifeforms.

Foldscope’s makers hope their creation will help diagnose common but devastating diseases including Plasmodium falciparum (malaria), Trypanosome cruzi (Chagas disease), Giradia lamblia (giardiasis), Leishmania donovani (leishmaniasis), Dirofilaria immitis (filariasis), Human Sickle Cell (sickle-cell anaemia), E. Coli and Bacillus and Pine strobilus.

The quantity of people that need to be checked for diseases is vast and means, in countries where incomes and resources are low, it just isn’t possible to undertake diagnostic services using conventional methods.

“There is definitely a huge gap between where we are and where we want to be,” Stanford School of Medicine Assistant Professor for Bioengineering Manu Prakash explained on the university’s website.

“When you do get it (malaria), there is this simple-minded thing ‘forget diagnostics, let’s just get that tablet’ – and that’s what happens in most of the world. But the problem is there is many different strains, there are many different medications, you could potentially make the problem even worse by not realizing that you have malaria. And at the same time, the people who get a severe case – they are not detected at all.

“What is that one thing that you could almost distribute for free that starts to match the specificity of what detection requires? For malaria, the standard is to be able to image, and sit on a microscope and essentially go through slides.

“What we found as a challenge, if you truly want to scale, you should be really testing more than a billion people every year: that’s a billion tests a year. Any platform that you can imagine needs to scale to those numbers to make an impact.

“One of these things that have been shown over and over again – if you can put (in place) an infrastructure to fight malaria that is scalable and sustainable, then you get retraction of malaria in different regions.”

Published: April 2014

Resources

1) World Health Organization: Facts on malaria from the WHO. Website: http://www.who.int/topics/malaria/en/

2) WHO: Ten Facts on Malaria: About 3.4 billion people – half of the world’s population – are at risk of malaria. In 2012, there were about 207 million malaria cases (with an uncertainty range of 135 million to 287 million) and an estimated 627,000 malaria deaths (with an uncertainty range of 473,000 to 789,000). Website: http://www.who.int/features/factfiles/malaria/en/

3) Instructables: How to build a US $10 stand to turn a smartphone into a digital microsope. Website: http://www.instructables.com/id/10-Smartphone-to-digital-microscope-conversion/

4) Microscope adapter app for smartphones: iPhone, Android, Blackberry or any Smartphone, with an attachment and an app, can be turned into a microscope. Website: http://internetmedicine.com/iphone-microscope/

5) Stanford University: Stanford University, located between San Francisco and San Jose in the heart of California’s Silicon Valley, is one of the world’s leading teaching and research universities. Website: stanford.edu

6) MaRS: Located in Toronto, Canada, MaRS is where science, technology and social entrepreneurs get the help they need. Where all kinds of people meet to spark new ideas. And where a global reputation for innovation is being earned, one success story at a time. Website: marsdd.com

7) Universal smartphone to microscope and telescope adapter/mount: The SkyLight is a universal smartphone-to-microscope adapter. Website: http://www.amazon.com/Universal-Smart-Microscope-Telescope-Adapter/dp/B00GF3Q3CK