Re: Nice try
"13c a day is a lot of money when you live on $1-2 a day."
Yes, but it's a two year cash pay back, and when money's short the discount rate rises disproportionately. That won't be how the target market express it, but it's the same principle that sees poor people paying 1,000% APR on payday loans in this country, or higher rates to loan sharks around the world.
That's why the inventors discuss lease type schemes, but the harsh reality is that this is too expensive for what will be a pitifully low light output. Many of the prospective users will also be buying kersoene for cooking, so why buy a one candle power device that you have to fart around with every twenty minutes when you've still got to buy kersene, you've already invested in a kersoene lamp that gives better light for longer, and the time value of the money means more like a three to four year pay-back?
If you look at energy efficiency schemes in the UK, people are hugely reluctant to invest in things that save them money, even when they do pay back. Take GU10 halogen bulbs - in a well used room replacing these with LEDs will give you a payback of about one to two years. Despite the fact that nobody is offering savers a 50-100% interest rate, most people are still buying and using halogens. Or look at the humungous flop that Green Deal has been. Even the health and safety benefits are of little appeal. In the developed countries the benefits seem logical and obvious. But in countries with high infant mortality, non-existent health care, roads like something out of Death Race 2000, and subsistence living subject to famine (ignoring unrest and civil wars), the H&S benefits of an LED lamp over a kersosene lamp count for nothing.
The problem here, is that the device offers inferior performance to that which it is supposed to replace, and requires a significant investment. Innovation has to do things better or cheaper, or both, and I'm afraid I don't think the inventors set their sights high enough. Everybody would like this to be cheap and effective, in reality it is neither, and the sum that gives a net benefit only works when you aren't seeing things from the perspective of the intended users.