Boom like that

This blew earlier this week, so I replaced it with a spare. Can you tell what it is?

After dinner it was a parish council meeting, which wasn't too contentious and didn't run too late.

The picture is the BA22d or BC22 or IEC 60061-1 (7004-10) end of a compact fluorescent lamp. While I did have a spare in the house, it's half the output and a lot slower, so I'll probably get a LED and put the spare CFL back in storage to use as a spare.

BC22 = bayonet cap 22 mm, apparently. Rather than the nasty American Edison screw fitting.