Alan wrote:
"Mark Trueman" wrote...
Ive got a fish tank cabinet that has 2 doors on it. The cabinet itself
contains a sump tank that is lit at certain times of the day and night.
However, even though the doors are a reasonably good fit, there is some
light spill around the edges of the doors when they are closed that i
would like to get rid of as it is annoying at night. I thought of maybe
using draught extractor strips on the doors cut to size to try to keep
the light spilling out, but was looking for other ideas on materials i
could use and where to get them. Maybe some kind of foam strips or
something.

Why do you need to light the sump at night?

Why not just use those brown rubber strips available from DIY outlets,
as the OP said, for draughtproofing?