I really like this idea and think it is fantastic for tropical and impoverished areas. But our houses in north America are a little different. It is probably possible to make a "solar tube" using the 4 inch aluminum ventilation tubes and a 2 litre. But it hit me that a lot of houses in suburbia have no windows facing the neighbors (for privacy). So, the front and the back have plenty of windows, but none on the ends. It is the case were I live now. And the sun hits that wall in the living room. If I didn't rent here, I would probably make this modification.
Just fill 3 or 4 two litre bottles with cheap isopropyl alcohol so it can't freeze. If you live in a really warm climate you could just use water. Then place high up on the wall. Use silicone to seal around the hole. I was also thinking that a small wooden frame could be made, like 6 inch square and fill in between the wood with rice paper. It would be a nice wall sconce, cheap and homemade.
And 4 of these would be like 4 lamps at 50 watts each lighting up the room, but with natural sunlight.
Richard
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