Using only sunlight for "power", these plastic bottles filled with water are providing interior light to the developing world. This is an amazing example of Permaculture Principle Six: Produce No Waste. Here is a quick video explaining this simple, but amazing, invention.
a little comment about this great idea... it might only work in roofs without insulation, because of the thickness (well, at least in my mind...and I wonder about avoiding leeks on the roof as well... i would like to try it out on my outside shower...I have a tile roof, but the walls are simply pallet boards, so I might try that to bring some light in... I also have a question, how long will that water last without turning green? would salt in the water avoid that? And how easy it would be to replace the water if needed ? ...or the plastic bottle as the sun eventually will destroy it... If anyone have any tips I would like to follow this conversation...
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