It's a "barn light," a 65 Watt CFL fixture that replaced a dreadful old mercury-vapor light a few years ago, and now it has failed. It's not the bulb; I changed that tonight and used my trusty non-contact voltage sniffer to confirm there's juice.
So, tomorrow, back up the ladder, some back and forth with Tam to confirm the breaker, and I'll be trying to install another light.
...If it's not raining....
CHICAGO RAILROAD FAIR, 1948
4 hours ago