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The light bottle is the invention of a Brazilian mechanic, Alfredo Moser. It’s also called a “solar bottle bulb” and is an environmentally friendly, cost effective, energy saving means of lighting during the day.

The light bottle is basically a plastic soft drink bottle filled with water and two capfuls of bleach (to prevent algal growth reducing the clarity of the water), installed by fixing it through a hole made for this purpose through the roof (usually easier if it is thin such as one made of corrugated iron) in such a way that the upper part of the bottle is exposed to the sun. The bottle is fixed in this position by the use of a sealant that also weatherproofs the area.

Solar Bottle Bulb Upper Part Allows Sunlight to Refract Through WaterSolar Bottle Bulb


A solar bottle bulb is used by the author to light the interior of a cardboard box, to demonstrate the efficacy of the device. The wattage of this device is said to be 40-60 watts at maximum capacity.


Sun light refracting through the bottle of water lights up the room and depending upon how strong the sun is, the wattage is quoted by Alfredo Moser to be 40 to 60 watts at maximum capacity.

The light bottle is cheap and easy to make and use and has been very useful in poverty affected regions of the world but also represents a clean cheap technology for lighting in most places and circumstances. Organizations such as the MyShelter Foundation working to support the spread of the use of the light bottle in poverty affected areas estimate that the bottle can continue producing light for a period of five years before needing to be replaced. It’s use over a five year period (even though it can only be used in the day time) is shown to result in significant GHG emissions and monetary savings on electricity charges, over the use of light bulbs for a similar number of hours.


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