Sam Goldman & Ned Tozun
Engineered by d.light, S20 is a lightweight, portable and solar-powered lantern.
Solar-powered lantern with mobile-phone charging capability. This product was discontinued and replaced by the d.light S30.
d.light’s GIVE d.light program pledges 10% of their sales proceeds in US, Canada and Europe to donating S20 lanterns to needy school children in the developing world.
Kerosene lamps and lanterns; Over 6 different single function and multifunction solar lanterns by d.Light: A2, S3, S30, S100, S500 models; Barefoot Connect 620 from Barefoot Power, M-KOPA IV Solar Home System from Mobisol, over 16 products in the E4C Solutions Library and over 80 products available in Lightininglobal.org.
Goal 7: Ensure access to affordable, reliable, sustainable and modern energy for all.
Off-grid households and small business that use kerosene lamps or candles.
This solar lantern is mass customized in d.Light’s four hubs in Africa, China, South Asia and the United States.
This product is patent-protected
Distribution to date about the S20 solar lantern is unknown, however, d.Light has sold over 20 million solar lights and power products in 62 countries through the four centers in Africa, China, South Asia and the United States, based on calculations done using d.light’s developing world sales and United Nations and International Finance Corporation research. The product is now discontinued.
Type of light bulb
Number of light points
A measurement of the brightness level of the lantern
Can the brightness level be adjusted?
Duration of lighting after a full charge
Can the user easily replace the light bulb if needed?
Type of energy used to power the lantern
Type of battery used
Peak power rating of the solar panel in standardized sunlight conditions, provided by the manufacturer
Manufacturer-specified battery capacity
Manufacturer-specified battery voltage
Can the user easily replace the battery if needed?
Can the user easily replace the light bulb if needed?
Design specifications include the upper face with the integrated solar panel and glow-in-the-dark button, LED light with two brightness settings (standard and high) and LED indicator for solar charge intensity. This product includes a multiple-setting handle that allows flexible usage. It is weather resistant to sun and rain.
The new S20 series does not need a battery replacement. Free 2-year replacement warranty with 3 – 5-year average lifetime. Replacement parts are available anywhere d.light is sold. Interview with representative
Over 5 years maintenance-free lifetime, including the battery. Over 60.000 hours of lifecycle for the LED light. The product has 2-year warranty.
By 2020, d.Light aims to reach 100 million people with their lighting products.
According to Lighting Africa (specifications sheet not available anymore), when fully charged, the battery runs on a total of 6.5 hours and 4.5 hours per day of solar charging, giving 4 hours of LED light on high brightness and 8 hours on medium setting. The total light output is 29 lumens, resulting in a 0,2 m2 illuminated area with more than 25 lux. The total lightning service is 130 lumen-hours per solar day.
The Comprehensive Initiative on Technology Evaluation (CITE) at MIT evaluated personal-use solar lanterns available on the market in Uganda and published the results in January 2015. The d.Light S20 received a score of 42/100.
Full findings are available in their report.
Tested independently by Lighting Global and the Comprehensive Initiative on Technology Evaluation (CITE) at MIT
There is no academic research on this S20 solar lantern, however, the IDE gives a review on the impact of solar lanterns:
Institute of Developing Economies (2015). Impacts of Solar Lanterns in Geographically Challenged Locations: Experimental Evidence from Bangladesh.
IEC Technical Specification 62257-9-5 which is informed by Lighting Global’s three complementary sets of test methods —the Quality Test Method (QTM), the Initial Screening Method (ISM), and the Market Check Method (MCM).
CE certification; IEC 60598-1, IEC 60598-2-4, EN 55015, EN 61547 compliances. Country certifications for East & West Africa (SONCAP, PVoC)
The Quality Test Method (QTM) is the full test method used to verify comprehensive product performance. Results from QTM testing are used to determine if a product has met the Lighting Global Minimum Quality Standards.
Lighting Global Durability tests passed: Drop test, switch cycling, physical ingress protection test, and protection from frequent rain
The Comprehensive Initiative on Technology Evaluation (CITE) at MIT evaluated personal-use solar lanterns according to a comparative framework for the evaluation of products, similar to the model used by the U.S. nonprofit organization Consumer Reports along the dimensions of Suitability, Scalability, and Sustainability. Students and faculty collected data on 11 solar lantern models from both field and laboratory tests, as well as through interviews, surveys, and participant observation of product users and Solar Sister distribution agents.
Similar to this product, there is the S30 solar lantern commercialize by d.Light.
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