A friend of mine (yes, I do have some) had one of those installed.
They have a narrow corridor type kitchen, and it lets in light so they don't need the normal lights on except at night,
and he was surprised at how little light outside it took to brighten up the room.
Even in the darker evening, it gathers the light and helps considerably.
I don't see these (yet) at the diy stores.
Only by dealers/installers.
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