A blue light on the road to Damascus
Sounds like the sort of mishap that I could acheive (Dangling DIY connector to my mobile power supply from the light connector comes to mind ) - a bright idea too far - In walks my father armed with a length of Alu tube curtain rail -yep - Ironic it was very nearly CURTAIN Rail. - Quick reacting digits saved the day - Safety first -Hummmmmmmm.
The industrial Safety Acts 1909 & 1911 come to mind.
Never switch a dual power supply fron 220v to 110v in the UK.
CAT III