Alfredo Moser: Bottle light inventor proud to be poor
Alfredo Moser's invention is lighting up the world. In 2002, the Brazilian mechanic had a light-bulb moment and came up with a way of illuminating his house during the day without electricity - using nothing more than plastic bottles filled with water and a tiny bit of bleach. In the last two years his innovation has spread throughout the world. It is expected to be in one million homes by early next year. So how does it work? "Add two capfuls of bleach to protect the water so it doesn't turn green [with algae]. Wrapping his face in a cloth he makes a hole in a roof tile with a drill. "You fix the bottle in with polyester resin. "An engineer came and measured the light," he says. The inspiration for the "Moser lamp" came to him during one of the country's frequent electricity blackouts in 2002. Moser and his friends began to wonder how they would raise the alarm, in case of an emergency, such as a small plane coming down, imagining a situation in which they had no matches.