Bruce Hall wrote:

I have approached the lamp manufacturer who can see no problem with my
proposal, apart from possible invalidation of the guarantee, which has
expired anyway. But what do you learned guys think?

Bruce, even standard RTV silicone is good for 250C, so it will be
absolutely fine in this application.

The only thing I'd mention is that unless you leave the silicone to cure
a long time (like a couple of weeks), you are likely to get some fumes
when you first fire up. You can minimise this by using the thinnest bead
you can, and leaving for as long as possible before switching on (at
least 48 hours).


--
Grunff