Windowless building get REALLY dark then.
That message got brought home to me many years ago in a large (but old) downtown shopping mall. Built long before the modern passive skylight phase, when a storm knocked out power and their backup lighting failed. 12:30 in the afternoon, but you could not see your hand in front of your face inside that mall, but for my small keyring light.
No matter how long you wait, you can't dark adapt to that much dark. My photon microlite let me find my way to my mini-maglite in my backpack.
The senior manager in the area didn't think I was being reasonable when I suggested that he have the area evacuated when Facilities was going to turn off ALL lighting AGAIN to troubleshoot. He thought everyone would be fine if they just didn't move.
He reinforced for me that your own safety is your own responsibility. (But visitors to this site already know that. :-)
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