It is made up of 4 components: (1) LED bulb (2) switch (3) cellphone battery rechargeable in any cellphone (4) solar PV (5) locally available materials such as empty transparent bottles, which make it easy to build and repair by users at the village level. All the components are chosen in such a way that it doesn’t require a control system, which drastically reduces the price of the lamp, making it the world’s cheapest lamp.
$2 Solar Lamp Designed To Help Bring Billions, Light - D.I.Y Bullseye
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