A Brazilian mechanic has invented a way of lighting his house during the day without relying on electricity.

Alfredo Moser has been using plastic bottles filled up with water and a splash of bleach to illuminate dark rooms since 2002 and now the idea has now spread across the world.

It is predicted that his lighting system, which works using refraction of sunlight, will be fitted in over a million homes by the end of this year.

The secret of the liquid which fills normal plastic drinks bottles that are often thrown away, is two capfuls of bleach added to water, which stops it turning green with algae when exposed to sunlight.

Mr Moser drills a hole in a roof tile and then pushes the filled bottle in from below, keeping the bottle in place with polyester resin, which waterproofs the 'window' in his roof.

He told Outlook on the BBC World Service that depending on the strength of sunlight, the light filling his home is the equivalent of between 40 and 60 watts.

The mechanic came up with the idea for his 'Moser light' during one of the frequent blackouts inBrazilin 2002.

He said only factories had power in his home city of Uberaba, in southernBrazilduring the energy shortage.

It was his boss that suggested using a plastic bottle filled with water as a lens to focus the sun's rays on dry grass to light fires in case of an emergency and Mr Moser developed the concept into his light.

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