It's a little hard to appreciate my new favorite device from these pictures. But this "before" picture was taken with room light and flash. See the plywood circle on the ceiling?
It was replaced with this "Sun Tunnel" somewhat like the ones we have at my office. There's a lens on the roof and a highly reflective tube through the ceiling to this diffuser.
This "after picture was taken with no electric light and no flash. I should measure the light. But it's as bright as a florescent and I can easily work at my desk with no electric light. This room has no windows. So the Sun Tube also means I don't have to turn on the light just to walk through to my bedroom. I can't wait to get more of them! Let's see, one for the top of the stairs, one for the bedroom hallway, another near my favorite reading chair...
The building guys had never seen one of these. So, I I was happy to catch this highly unusual event on film: men reading instructions.