Check out these solar lights

Phoenix, AZ

That was really interesting, I wonder if it's HOA approved? Lol

Moss Point, MS(Zone 8b)

I think it is a wonderful idea in poor countries with lots of sun and a warm climate. I wasn't able to figure out how they were securing the bottles and installing to prevent leaks but I know impoverished people around the globe could benefit from this idea. I'm always so glad to see such good problem solving that didn't have to come out of corporate R&D or a big university.

Christiansted, VI(Zone 11)

Amazing! I have a very dark room, it'd work for me!

Questions: What dos the black ? film canister do? Protect the cap, why is this needed?

and, How does the plastic hold up against the sun? Sunlight here makes plastic eventually get brittle, break up, and then just kind of evaporate or disappear somehow. Does take months of full exposure.

Old sailing ships had, umm, I think they were called prisms. A solid piece of glass, through the deck, flat on deck, but a lovely upside down grooved bell shape on the inside of the boat, on the 'cieling', that brought sunlight inside.

I woder if beer bottles would work? hahahahahahaha!

San Marcos, TX(Zone 8b)

I wonder if the water in the bottle also helps the plastic hold up.

So.App.Mtns., United States(Zone 5b)

Very clever idea! It is a basic optic lens (like fiber optics)... the water acts as the optics, and the clear bottle lets it shine through. I'd guess the water magnifies the solar rays through each droplet. Since only the bottle neck protrudes through the roof, and is protected (somewhat) by the film canister, the PET bottles don't degrade as quickly. I bet they get pretty warm, though.

Christiansted, VI(Zone 11)

But,

Being Brazil, I think those could be glass bottles.

Biggs, KY(Zone 6a)

Is that the sunlight being magnified through the water during the day?

Glendale/Parks, AZ

The video says they are 2 liter soda bottles. Are those bottles glass in Brazil Molamola?

So.App.Mtns., United States(Zone 5b)

Yes, Cajun, it is...

Great find on the story, rtl... I'm thinking I may make several to put up in my ancient/decrepit barn. Not sure the roof will hold me to caulk the protruding part of the bottles though.

Christiansted, VI(Zone 11)

The fresh caulk can handle that weight. Or do you have to stand there and hold the bottle until the caulk cures?

So.App.Mtns., United States(Zone 5b)

LOL, I'm not worried about the caulk... it's my decrepit barn roof holding ME (even to just get up there and apply caulk) that's worrisome!

Biggs, KY(Zone 6a)

Think hummingbird and hover!

Christiansted, VI(Zone 11)

Brazil, I visited long ago, doesn't have the 'throwaway' mentality that the US does. Back then, mostly due to a lack of prosperity, they did a lot of recycling.

Darius, go inside out? Or is the loft as bad as the roof?

So.App.Mtns., United States(Zone 5b)

No loft... just a tin roof over saplings for rafters...

Christiansted, VI(Zone 11)

Ha!

Pff, who would build that!!??? Fire the buggar!

Ffld County, CT(Zone 6b)

I sent this to my mom. She said it was a good idea and she wouldn't mind giving it a try but the guy in the apartment upstairs might wonder why his floor had all these bottles in it....

:)

Mid-Michigan, MI(Zone 5b)

I want to try this. :)

St. Louis County, MO(Zone 5a)

I have a dark family room but the side wall faces South, I wonder if they work from the side?

Christiansted, VI(Zone 11)

Cathy, check during the day to see if any sunlight hits that roof. And guess if it gets any sun in the winter. Oh.

Now is a great time for you Northerners because the sun is almost as far north as it gets. June 21 and it starts back south.

How well would this gizmo work with no direct sun hitting it? Could a glassblower make something similar? Easier to fit and seal against weather? How about freezing in the winter, would the glass shatter!!? Maybe better: a solid glass sunlight. Doesn't freeze anywhere in Brazil, unless maybe waaay far south.

Blabla, Melissa

So.App.Mtns., United States(Zone 5b)

Melissa, google deck lights (like they used on old sailing ships)... that will give you information about some similar lights made from glass.

Christiansted, VI(Zone 11)

Yup, they were called Prisms. I'm an old sailor. Didn't bring much light into the Regina Maris, an old sailing ship I sailed with for a month way back when. I think the top of those bottles being taller than the roof, rather than flat with the surface would bring more light in. ??

San Francisco Bay Ar, CA(Zone 9b)

We had prisms to let light into the cabin when we built the boat. Worked very well.

My sister installed one of those flexible solar tube in her home bathroom, but it doesn't really provide a lot of light. I told her she neede to have a prism extending below the surface of the ceiling to refract the light into the room. Not sure she believes me on that one. I'll send her this video. Maybe she'll get the idea.

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