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" ... So far so fun - so now a prediction about this current effort and how things are going to change in the future. In the past, as recently as 10 years ago, the presence of electric lighting really meant the presence of the electric grid. That has for a long time been a good proxy for some form of development as well. Nowadays this is not so. What with simpler solar systems which charge up to power an LED for the evening or even all night we've got a very different light distribution. It simply isn't necessary for there to be a millions of $ investment in a grid, nor even thousands of $ in a generator, for there to be nightime light generated. There are systems which can power a bulb, bulb included, for $10 these days. Thus the connection between light and economic development is changing drastically. ... "