can i use a socket as the power source to connect a ceiling light?

If you plan to do this because of difficulty in wiring the ceiling rose then post another question - an easy job once you know the secret...

Continuing Good Luck...
February 2017

Yes of course you can - I wonder why you would wish to do so.

I have seen houses in Sweden with ceiling lights having cables strung out below the ceiling and down to wall sockets - most ugly...

Bedside & table lamps are powered from wall sockets - but an appropriate fuse should be fitted in the plug - 3 Amps or below.

If you're doing paid work for this then probably not...

Good Luck...
February 2017