This is the most popular torch used by farmers in villages these days.
It involves elementary electronic circuit with one battery, one resistor, two LED lights and one switch, all put together in multi-purpose plastic box. It is assembled at shops/homes (home industries???).
It is light weight, small in size (slightly bigger than a match box) and hence carried in pockets.
Cost: Rs.20
Battery life: 50 hrs with very good constant brightness, followed by another 24 hrs with low brightness. I have verifed this myself by experimenting with one torch by keeping it on continuously until it dims down fully. I don't know the battery life for torch with incandescent bulb, but I guess it should be around 10hrs.
Myth: There is rumour that the battery can be recharged through solar energy. And hence, I have heard, people keep it in sun light to recharge! This myth is used as marketing strategy. The fact is the battery life is very high as compared to conventional torches with incandescent bulbs.
Note: Battery cost is Rs.10. It can be replaced once it is drained out.
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