Alfredo Moser: Bottle light inventor proud to be poor

On old sailing ships many had prism light while flush with the deck doen below with the use of prism is would provide a good amount of illumination.

Clever idea.

I like the bit where author poses the question "how much energy do the lamps save?" and then chooses not to answer it and veers off
into some stats about CO2 emissions.

Not to be a dink, but an invention which creates light... only when the sun is out?
Sounds a lot like the "window" or "skylight" to me. Reminds me of how NASA spent a ton of cash on a pen that worked in space while the Russians used pencils.

"Oh geesh, it sure is dark in this windowless room"