Category: Lighting Techs

SunNight Solar

 SunNight Solar

5802 Val Verde St.
Suite 100
Houston, Texas 77057



SunNight Solar is leading a new movement in delivering products to the consumer, focusing on what is being called a ‘triple bottom line’ or a 3P approach – people, planet and profits. All of their operations and programs have all three of these elements – they have integrated social and environmental benefits into every aspect of their company, while earning the profits which allow them to grow, develop new products via dedicated research and development and provide a return to their employees and investors.

The founder of SNS, Mark Bent, lived in Africa for over twenty years, first as an American diplomat, then as an oil executive for a French firm. While living in Eritrea in 2005, he wanted to provide lights to some of his friends, employees, and some children he had befriended who survived by scavenging in the local dump. When he could not find anything suitable – he started SNS, made a light which is now the leader in off-grid lighting products in Africa, parts of south and Central America . They also anticipate this light – their SunLight series – to quickly become the flashlight of choice in the US , Europe and the rest of the developing world.

They are based in Houston , Texas . The senior management team has a variety of skills, backgrounds and areas of concentration – international sales, chief of operations, head of logistics, etc. They are also augmented by a team of research scientists, engineers and specialists, some based in the US , as well as a number from Europe, China , New Zealand and elsewhere. They bring people together for specific tasks, and also have the opportunity to call upon the top universities and scientists in the world – they greatly appreciate the benefits of on-line collaborative research. They partner with a firm called Innocentive – – which offers cash awards for ‘solving’ technical challenges.

They are working on additional products – lights as well as water treatment and other solar consumer products. They are presently involved in research on a solar powered device which kills, repels or sterilizes the female mosquito. They are also looking at hydroponics.




  • Night Glow Strip – it is easy to find in the dark
  • High efficiency Polycrystalline Solar Panel
  • Charges in 8 to 10 hours of full sunlight
  • Provides 5-6 hours of illumination every night
  • Hard ABS Plastic Exterior – highly water and shock resistant and shaped to fit comfortably in your hand
  • Carrying Hook – hook it to your backpack on the go, or hang it up to illuminate a wider area
  • Battery Compartment – powered by 3 standard NiMH, AA rechargeable batteries, 800 mAh
  • 6 Super Bright White LEDs
  • Dimensions (Length x Width x Thickness):  8.5″ x 2.5″ (body) or 3.625″ (head) x 1″ (body) or 2″ (head)



  • Electronic “kerosene lantern substitution” design funded by a grant from the Rockefeller Foundation. In 3rd world use this same light will save users money presently spent on lighting kerosene and reduce carbon particulate inhalation and fire risk
  • High efficiency “boost converter” and “constant current” LED drive ensures constant user selected level of brightness regardless of state of battery charge
  • Charge termination to protect batteries from over-charging
  • Turns off when battery is almost flat to protect battery and improve battery life
  • High efficiency Polycrystalline Solar Panel
  • Batteries charge in 8 to 10 hours of full sunlight
  • Batteries are air-cooled for better operation in very hot conditions
  • Wide beam “Room Light” and bright narrow beam Task light mode
  • Low, medium and high settings in both Room Light and Task Light modes. This allows either high intensity or extended periods of use. On a fully charged battery, high will typically operate for 4 to 5 hours, medium for 8 to 10 hours and low for 16 to 20+ hours. (Duration will reduce as batteries age)
  • Night glow strip – easy to find in the dark
  • Single piece case – rugged, requiring no screws to hold the body together
  • Water resistant
  • “Turn off in sun” and “turn off when nearly flat” features allows use in path light or night light mode. Small battery reserve allows auto turn on again with same setting next evening
  • Carabineer clip for one handed attachment to backpack, ropes, branches etc
  • Half Watt polycrystalline (not amorphous) high efficiency photovoltaic panel.
  • Six narrow angle high efficiency LEDs for task light illumination
  • Three wide angle high efficiency LEDs for room illumination
  • Three NiMH batteries – better for the environment – We do not use NiCad batteries
  • High impact resistance ABS body & polycarbonate lens
  • Dimensions   Length     x     Width     x     Thickness:  Head/Body      9″          x 3.8″ / 2.4″   x      2.3″ / 1.3″
  • Weight – 11 ounces / 300 grams


Additional Comments from Our Engineering Staff – The SL-2 Super BOGO light is intended to be a rugged, long life, solar rechargeable light whose primary purpose is for kerosene lantern replacement and task lighting in developing world applications. It was designed to provide wide angle illumination with more usable light than a kerosene hurricane lantern in rooms up to 4 x 4 meters, or as a study or work lamp over a table, while also providing a bright directional “task light” beam when more directed light is required.  In a kerosene lantern replacement role it can save users in excess of 30% of their monthly energy expenditures while eliminating fine carbon particle inhalation and preventing injuries from burns due to kerosene spillage or similar accidents.


The features which make it suited to its primary role in the developing world also make it a great light for use for camping, automobile use and as a light you will always have ready in an emergency.  Leave it where the sun shines on it and you will get hours of operation when needed.  With a fully charged original battery the SL-2 will typically operate for 4 to 5 hours on full power, about twice that on its medium power settings and 4 times as long on low power.


The SL-2 uses a high efficiency polycrystalline silicon photovoltaic panel (or PV panel or ‘solar panel’) to charge its batteries.  The charging capability is limited by the size of the panel which would fit on the light, as in the SL-1. Depending on battery state it takes 8 to 10 “sunlight hours” (hours of direct full sunlight) to charge the supplied three 800 mAh NiMH batteries.  Users can choose to fit larger capacity batteries which will take proportionately longer to charge.  In African summer conditions a full charge should be able to be achieved in a single day. In less sunny conditions only a partial charge will be achieved in one day.  A light which is only occasionally used can accumulate a full charge over a number of days.  When the light is in use every night, as it will often be in developing world use, the hours of use per night correspond to daily sunlight hours. The medium and low power modes allow users to reduce lighting levels to allow longer lighting times when charging conditions are poor. On full power users get about 30+ minutes of lighting per sunshine hour. On medium power they get about 1 hour of operation per sunshine hour. And on low power, about 2 hours operation per sunshine hour.  So with 2 to 3 sunshine hours in a day a user can expect 4 to 6 hours of low level but useable light.


When suspended vertically about 1 meter above a 2 x 2 meter (6 foot x 6 foot) table an SL-2 will provide enough light for reading or other work. The light levels are low by grid lighting standards but surprisingly useable once your eyes adapt.  In a smaller area, say 1m x 1m (3 foot x 3 foot) a number of people can still read or work usefully at substantially higher light levels.  In all cases the light illuminates the surface better than a kerosene wick-lantern or hurricane style lantern would.


Unlike most other lights in its class, the light output of the SL-2 remains at the user selected level regardless of the state of battery charge (except as the battery nears the very, very end of its capacity levels will fall off).  To maximize battery life, operate the LEDs correctly and provide constant lighting levels the Sl-2 uses a “boost converter” – essentially an ‘electronic gearbox’, which takes the slowly dropping battery voltage and boosts it to a level suitable for providing a constant operating current for the LEDs. Unlike most LED lights the SL-2 operates its LEDs electrically “in series” so that the same current flows through all operating LEDs. This allows the current and thus the brightness to be closely controlled so that the LEDs are operated in the manner recommended by the manufacturers.


When the battery capacity is almost exhausted the light will first dim, then flash, then the LEDs will turn off completely. A small amount of battery capacity remains and this is used to “keep alive” the control circuitry in a “standby mode”. If a light which turns off due to a low battery condition is then exposed to sunlight it will charge its battery and then, when the sunlight is again removed, turn on again in the same mode as it was in previously. This feature allows the light to be used as an automatic path light, streetlight or nightlight. To achieve regular operation in this mode the light needs to be placed so that it is charged daily. (For 10 hours of night time, a light set on low will operate throughout the night when charged for 5 sunlight hours or more. If there are less than 5 sunlight hours available the light may turn off before dawn but will still usually operate well into the night. If the light is not charged the battery capacity will continue to drop.  When it reaches too low a level the light will reset fully and the light will then draw no battery current but the last mode is no longer remembered.  If a battery is removed or a battery “door” is unscrewed more than about 1/4 turn the light will turn off and the last mode will not be ‘remembered’.


When an operating light is placed in sunlight so that charging starts the LEDs will turn off. The light “remembers” what mode it was in and restarts in this mode when the sunlight is removed. If the light is charged for long enough to fully charge the battery, the charging then stops to protect the battery from over charging.


Battery capacity will decrease with time. Use of user installed larger capacity batteries can be expected to provide longer battery life both because of the extra initial capacity and because the batteries are not “deep cycled” so often in normal use.   Battery capacity is measured in mAh (milliamp hours). Operating time on a fully charged battery is about mAh/200 hours. The initially provided batteries are 800 mAh capacity and will provide 4+ hours of full power operation. If users fit eg 2500 mAh batteries they can expect about 2500/200 = 12+ hours of operation. Charging time is about mAh/80 sunshine hours. So an 800 mAh battery will take 800/80 = 10 sunshine hours to fully charge and a 2500 mAh battery about 2500/80 ~= 30 sunshine hours. On a good day charging will exceed these levels but these are a good guide of what may be typically expected in full sunshine. Obviously it will take several days of full sunlight to fully charge a 2500 mAh battery. Batteries will charge when light levels are lower than full sun, but charging will take longer.  Charging starts with about 6% sunlight and increases approximately linearly with increasing light levels.  A very bright but clouded sky can charge at 25% to 50% of maximum rate.  When charging, to achieve maximum charge rate the panel should be angled to point as directly at the sun as possible.  If leaving in the sun all day, angle the light so that it points at the “arc” in the sky that the sun travels over and so the light is pointing squarely at where the sun will be at midday. (Easier to do than describe).  If desired the light can be moved several times during the day for best effect, but the gains are surprisingly small compared to aligning the light in its best position initially.


Note that batteries MUST be inserted with all the positive ends DOWN (non-flat ends inserted first). The battery doors can be screwed tight, or opened, using a coin



d.light Headquarters
International Sales (all world except India & North America), Product Design     d.light design
Clifton House, 75 Fort Street
PO Box 1350
Grand Cayman
KY1-1108 Cayman Islands

India Sales & Marketing     Jadoo Lighting Private Limited
A-56, Sector 64, Second Floor,
Noida, U.P. 201301 India
Tel.: +91 120 4637344/46
Fax.: +91 120 4637338


d.light design is dedicated to bringing modern lighting and power to over 1.6 billion people globally currently living without electricity. We aim to be the #1 player in off-grid lighting and power solutions worldwide. We are a high volume manufacturer customized design house.

High Volume Capabilities
d.light is a high growth company financed by prestigious venture capital firms including Draper Fisher Jurvetson, Garage Technology Ventures, Mahindra and Mahindra, and Nexus India Capital. They also have investment from leading social enterprise funds, including the Acumen Fund and Gray Matters Capital. Their engineering team includes full-time product designers, mechanical and electrical engineers and a high volume manufacturing / quality control team, managing every aspect of the supply process from concept through high volume production. This allows us to scale quickly with distributors ready to meet specific market needs.

At our heart, d.light is a product design company. They are looking to partner with distributors who can provide customer and market feedback which we can integrate into new product designs. Their product design team can rapidly integrate design changes into future product iterations, and we are continually expanding our product line to provide comprehensive lighting and power solutions.


By 2017, they will replace every kerosene lantern in the world with safer, brighter, and more affordable lighting. Like the eradication of small pox and soon polio, we can provide everyone with access to a basic human need: safe and bright light.


d.light design offers a revolutionary product line of affordable and energy-efficient power and light solutions. Using cutting-edge technology from Silicon Valley the d.light product line provides economical, safe and high quality replacements for kerosene lanterns, candles, and emergency lanterns.

nova Nova
The Nova, available in both solar and AC chargeable versions, provides up to 40 hours of bright light on a full charge at efficiencies 30-50% greater than fluorescent lights. The Nova is several times brighter than a kerosene lantern and offers a variety of features including brightness level settings and a battery life indicator.
Vega Vega
The Vega is the perfect solution for households with irregular access to electricity. Using our proprietary fast charge technology, the Vega provides about one hour of high quality light for every hour of charge.
comet Comet
The Comet, available in both solar chargeable and AC chargeable versions, will provide light several times brighter than a kerosene lantern at a very affordable price.

SELCO Solar Light Ltd.

SELCO Solar Light Ltd.

#742, 15th Cross, 6th Phase, J P Nagar
Bangalore – 560078, India
Tel: +91-80-266-545-09
Tel: +91-80-266-545-10


SELCO INDIA, a social enterprise, provides sustainable energy services to under-served households and businesses in India. Through its 25 energy service centers in India, SELCO has brought reliable, affordable, and environmentally sustainable electricity to more than 75,000 homes and businesses since 1995. From solar lighting and electricity, to clean cooking and wireless communications, SELCO aims to empower its customers by providing complete packages of product, service and consumer financing, in a very holistic manner.

There are over two billion people who currently lack reliable access to electricity. Many more lack access to clean cooking, water, telecommunications and productivity enhancing technologies. At the same time tremendous changes in the photovoltaics, telecommunications, cooking and water technologies have made provision of these services economically possible in an distributed fashion — one household and business at a time.

SELCO believes that poverty alleviation and climate change are very interrelated. It firmly believes that using its refined and proven business model, solutions exists for poverty and better environment. SELCO provides channels for income generation via sustainable energy by piggy-backing on traditional finance and micro-finance.

SELCO’s employees envision a world in which no family needs to burn oil lamps for light, no indoor pollution because of unhealthy cooking methods, where wireless digital communications are available to everyone, and where young people can see a brighter future via clean energies. SELCO is uniquely positioned to serve the needs of the under-served and SELCO will make it happen in a very sustainable way.


Their mission is to empower the lives of under-served populations throughout the world by selling, servicing and financing services that improves their quality of life in a holistic manner.


SELCO INDIA was formed in 1995 to sell and service solar electric home lighting systems in areas of India lacking access to reliable electricity. Headquartered in Bangalore, India, SELCO presently has 165 employees in its operating subsidiaries. Since 1995, we have sold, serviced and financed over 75,000 solar electric units to our customers.


SELCO provides packaged electricity systems and related appliances. Our systems utilize solar photovoltaic (PV) modules to provide electricity for lighting, water pumping, communications, computing, entertainment, and small business appliances. These products can be purchased by individual homes and businesses and do not require connection to a larger network. We also design larger commercial/industrial systems to meet specialized applications.


  • Solar Home Lighting System (SHS):
    Our primary product is a solar home lighting system (SHS). The SHS is a branded solar electric lighting system designed for households and small businesses lacking reliable and safe electricity options. SELCO System includes:

    • Roof-mounted solar photovoltaic module
    • Deep-cycle Storage battery
    • Charge regulating circuit
    • All interior wiring and switches
    • Electric lighting fixtures
    • Connection for 12 V appliances

    A typical system schematic is shown at right.

  • Related Appliances:
    Over the years the management has realized that for SELCO to reach the millions of underserved, in a sustainable way, there has to be a link between technology and income generation.Recently, we have begun to offer additional appliances that work with our solar electricity systems, including technologies that enable income generation and communications.

  • Commercial / Industrial:
    SELCO also serves commercial and industrial customers with custom design and installation. We have a designated central headquarters team to design and sell larger power systems for commercial and industrial users. We have installed grid-connected, and stand-alone systems of up to 20KW.