The d.light S250
While the d.light S250 is a great product, it is priced too high to make much of an impact on the developing world where a poor farmer might make as much as $2 a day. The absolute key to the developing world is price with $10 seeming to be the tipping point. There is a comparable solar light to the S250 from China for about $13 and that is getting to the point of saleability. For mid to high end users in developing countries, this has a chance to be a market leader, but they must figure out how to drop the price.