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Those bottles of light...


Externet

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Shown on some reports of third world innovative diy gadgets, they have a led lighting a water filled soda bottle. (This is not the 'skylight' similar approach that funnels sunlight and rain leaks into a dwelling)
How does the addition of the soda bottle optical losses improves illumination than the bare led alone ?
The difference I see is it creates a non-point of light emission by being a bottle-sized body of emission with some according gentler pupil reaction.

Now, the "old" battery mentioned.  Why old ?

image.png.8bd993ebfeb3ed0de9cebf18a7821b90.png

 

Next, about the skylight bottle.  Why is it perceived better than a transparent piece of roofing ?  Is it from the strong habit in modern offices/homes to cover windows with draperies and then turn on the lights ?

image.png.9e5f479b4e6110d584d015c98f40537c.png

 

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45 minutes ago, Externet said:

 Now, the "old" battery mentioned.  Why old ?

Because you don’t need a new one, probably.

45 minutes ago, Externet said:

Next, about the skylight bottle.  Why is it perceived better than a transparent piece of roofing ?  Is it from the strong habit in modern offices/homes to cover windows with draperies and then turn on the lights ?

It does a better job of dispersing the light. 

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