In article ,
John Rumm wrote:
Jeremy C B Nicoll wrote:

in is a long-term solution as far as I'm concerned because - I
assume - we'd need to tear the ceiling down to get at the present
main wires buried in it, to remove them. The switch for this light
is also at ceiling height so I wouldn't guarantee that the whole
supply might not be high up. That is, there's no certainty that I
could find the light's supply under the floor and terminate it.

You can get 12V transformers that are small enough to go through the
mounting hole for the lights themselves. So if you already have
switched mains routed to several luminairs, then it would be
simplest to go for one transformer per light.

Unfortunately we don't have luminaires mounted in holes at all. We
have a surface mounted triple spotlight.

--
Jeremy C B Nicoll - my opinions are my own.