He has just chucked out the clipspot that might possibly be worth keeping if the fault is with the light assembly rather than with the AC/DC converter
And it would only take a little while with a multi-meter to see where the fault lay
and if the AC/DC converter turned out to be fine it might just be worth saving it for if the same component on the other similar light we have develops a fault
there comes a point when the answer to every thing is
and when that point is reached, it is better to shout it at a minor thing than explode at a MAJOR thing.
(And by the way, the next time you - and you know who I mean - plays "daleks" with the standard light YOU ARE IN FOR IT. TOTALLY. ABSOLUTELY. It will be scales and Czerny for you for the rest of term - gottit?)
((I only posted this because I wanted to use the phrase "end to mending". But I DO mean it about NOT playing "daleks" with MY lamp while waiting for your piano lesson. Go and get your own lamp and break it at your house!))