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Lately, someone figured out how to fill a plastic pop bottle with water, stick it in a hole in the roof, and light the home interior, for free, as long as there ambient light outside.


I saw that. It was in So America, right? I've been thinking about installing some of those in my pole barn/office.

Seeing that led me to play with filling a 2 liter bottle with water and replacing the cap with an LED flashlight, and that actually makes a very beautiful sort of lamp, especially when you use bottles that have well defined ribs in them, like some juice bottles. I suspect that a bottle could be designed that would act like a lens (Fresnel perhaps?) to improve the way light is cast.

I'm thinking that I might make a sort of "Street Lamp" with maybe 3 or 4 of these bottles hanging from arms attached to a pole that has a solar panel and battery on top of it, or just get some of those cheap solar yard lights and use them, and placing a few of them along my driveway.
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