IMM wrote:

Potentially you would expect more water vapour to get through using an
open
pipe arrangement than using the old teracotta pot which can also be sealed
to some extent.

use plantpots, as these are cheap and fireproof. Seal up the hole if there
is one. Cut a notch in the rim for the cable and seal around the rim with
silicon.

How does this help? The requirement is to stop the light getting too
hot, if you completely enclose it in a flower put and even seal it up
then it'll get even hotter won't it?

--
Chris Green