Indoor lighting with pop bottle

Just heard about this today and thought I would share.  Basically consists of a water/bleach filled plastic pop bottle in a hole in the roof.. during the day time can allow in the amount of light equal to a 50 watt bulb!

Wouldn't work for me in the winter.... but who knows.. maybe able to figure something out. Anyway, here's the link for anyone who is interested:

http://isanglitrongliwanag.org/

Did a search and didn't see this had been shared on this group. My apologies if it is a repeat.

The soda bottle – skylight keep cropping up on different forums.  Eventually, the plastic of the bottle will rot, and leak.  In heat, and then cold, the bottle expands and contracts, stressing whatever is holding it.  Even here in Yuma, stuff up at the roof can freeze at night (sky radiation) even though the air is not down to freezing.

Reminds me of deck prisms on old boats or the pyramids used in siewalks for basements rooms in some cities.

  Topic done to death before,two new ones this week alone.    And thus my post gleaned from archive        For any climate colder than San Francisco this is a very bad idea in a heated space. Liquid filled bottle will be a huge thermal wick and rob you of far more energy than it supplies. Use these bottles on your shed but not in a heated building. Almost any window idea you can come up with will be better than this one. You'll notice none of the roofs in the videos were insulated. This isn't because insulation is unnecessary, it simply a function of poverty and lack of resources. A roof like that gets hot as hell here in Canada so it must be even worse in tropical heat and humidity.