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This is not a light bulb, it's a deck prism. And it's not sustainable, it's recycled. The other drawback is it's still another hole in the roof. But it would certainly be cheap to replace.

Here's another idea. Glue all those bottles together and build a boat. Fill them with recycled styrofoam peanuts and it would be nearly impossible to sink. The same material could make a well-insulated house with built-in "lighting" - the entire structure would be a skylight.

The idea isn't bad, but the headline was badly chosen.