In poorer areas, houses are sometimes made by essentially stacking up and leaning sheets of metal against a few pieces of wood, more or less. Decent windows often aren't a very viable solution. Light bulbs would be usable, but you sometimes have to get electricity (if available at all) by literally running a wire either directly to the power line or across the road and then stringing it up to the power line yourself. So your comment misses a key point about life in these countries.