The d.light S2 is a solar powered, personal-use LED lantern.
Main market in India with offices and operations in China, United States, and East Africa.
Rs 450 + RS 80 for shipping (about $8.28 USD), $15.99 USD for purchases within North America. The goal is to provide lighting solutions under $10. d.light through their `GIVE d.light’ program pledges 10% of their sales proceeds in US, Canada and Europe to donating S2 lanterns to needy school children in the developing world.Generally product sold without subsidies.
Very strong solar market: Over a dozen different lamps and lanterns available: d. light’s own S1, S10, S20, S250 and S300.
Competition: Sun King, Tough Stuff, Nuru International, Megabrite, Green light Planet, Great White light, Firefly mobile lamp, Powa Pack S Lighting System and more.
Kerosene lamps and lanterns.
People living on less than $5 a day in emerging markets (especially rural India, Africa and China), who use kerosene oil lamps for home lighting.
IP Protected. (Patent Unknown)
Main market in India with offices and operations in China and East Africa and sales in 42 countries. Main distribution outlet is d.light website and Amazon, but also available through organizations like Kopernik. Additional local distribution done though social enterprises such as M-Kopa in Kenya.Occasionally via World Bank projects such as the World Banks Tanzania Energy Development and Access Expansion Project has incorporated several pilot projects promoting the inclusion of low-cost lighting services into the Tanzania Rural Energy Agency’s activities.
Over 10 million customers worldwide.
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?
One brightness setting No Battery Replacements Needed Integrated Solar Panel Dual Solar / AC Charging Battery Charge Level Indicator Glow In the Dark On/Off Button Water, Dust and Impact Resistant Lightweight (120g) Adjustable ultra bright LED 60,000-hour life Package dimensions (in) (WxDxH): 4.0 x 7.0 x 5.8 Unit Weight: 5.3 oz
Sales agents. Very little technical support required.
Replacement products are available under warranty. No replacements parts are available.
Meets Lighting Global Recommended Performance Targets & Lighting Africa Minimum Quality Standards. From the Lighting Global Standardized Specifications Sheet:
Performance Measures Total light output (lumens): 25 Total area with illumination > 25 lux** (m2):0.12 Total lighting service (lumen-hours / solar-day): 120 Full battery run time* (hours): 6.5 Run time per day of solar charging* (hours): 4.7
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 S2 received a score of 43/100. Full findings are available in their report and as a snapshot synopsis is available in the image included here.
Tested independently by Lighting Global (see verification of product quality) and the Comprehensive Initiative on Technology Evaluation (CITE) at MIT
No listed hazards.
Because the system is solar powered, gains in efficiency can only be made in improving the efficiency of solar energy collection or reducing the energy used by the product, although it serves as a complement to many other products.
There are articles on d.light lighting solutions, and their potential impact in countries of need.
Stanford School of Design is where d.light started and the school still offers courses but it is unclear how much they are still involved with the product. Lighting Africa University Test Centers: University of Nairobi, Humboldt State University (USA) and Rensselaer University (USA).
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 compliance. 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 comparative framework for 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.
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