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What is an LED

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness. (Source: Wikipediahttp://en.wikipedia.org/wiki/Light-emitting_diode)

How do we recharge the study lights?

The lights can be charged through the supplied 1.0 Watt solar panel. The Study Lights can also be charged from the mains using any of the popular mobile chargers (thick or thin-pin type). Ideally the time required to charge through the mains is 2-1/2 hours whereas it takes about 6 - 8 hours on a sunny day to fully charge the light using the solar charger. Solar bulk chargers are available for schools, where at a time 20 to 50  students can charge their lights. For more information please visit our 'How OneChildOneLight Study Lights can be charged in a school' page.

Important:-

 

  1. In case of emergency (i.e., sunlight is not available for a long time) charge light using only a genuine Nokia mobile phone charger with matching pin. Never use other types of chargers as it will damage the light and void the warranty. 
  2. A charge of 3 hrs is sufficient while using Nokia charger and irrespective of green indicator light showing. It can be disconnected after 3 hrs of charge. 

Can I buy a Study Light for my personal use

Yes! Anyone can purchase one of the Study Lights for personal use, or as a gift to a deserving child or loved one. Whenever a study light is purchased for personal use, a certain percentage of the proceedings goes towards maintenance of this project.

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What type of batteries are used in OneChildOneLight

The rechargeable battery pack comprises of two high quality NiMH batteries connected in series.  It produces 2.4 volts and 1200 mA current when fully charged.  It can last 2  years.

What type of charger is required to charge OneChildOneLight

If the charging is done using grid power from the mains, the study lights can be charged using any Mobile Charger with output 5.0V/350mA D.C or alternative good quality Ni-Mh Charger with output Voltage 5.0V, 275-350mA. For charging though Solar, 6V D.C, 1Wp Mono / Polycrystalline type panels can be used. 

What type of LED is used in OneChildOneLight

OneChildOneLight uses one 60mA LED from NICHIA, which are considered to be among the best in the world. The Nichia Superflux LED from Japan produces 30 lumens of white light and operates at 3.3 volts and draws 60 mA current.

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What kind of Electronic Circuits are used in the lights

The main electronics of the light are driven by an “ON SEMI conductor” which boosts the 2.4 volts battery to 3.3 volts and supplies a stable voltage and current to the LED from a charged battery. 

What kind of solar panel is supplied with the Study Light

 

  1. The solar panel is made of mono/poly crystalline material, encapsulated behind glass, with an aluminum frame with a 3.5 mm connector.  
  2. The solar panel generates approximately 5.5 volts and 114 mA current under bright sun light conditions.  
  3. The solar panel is made to work for many years of daily use. 

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