"Jack the Lad" wrote in message
m...
"The Question Asker" wrote in message
...
Its suggested by the manufactures to cut a circle of rockwool around the
downlighters. As for the heat loss I think it will be negligible unless
you
are planning on installing hundreds of them, Also the back of the lights
is
I think meant to be clear for about 10-20 cm

You need to construct a small box with air holes to fit over the back
of the fitment because in the future someone might otherwise disturb
the rockwool and thus cause a fire hazard.

Best install a plantpot over and seal with silicon sealing. A decent sized
one will do, with a bit of air in there.