Mark wrote:

is it a wireless intercom or wired?

Mark



If it's a wireless system I'd say you're out of luck unless you replace
the lights or get an intercom that can filter out the interference.

If it's a wired intercom, You may need to make sure the lights and the
intercom are fed their AC power from different branch circuits.
Also, you may need to replace the wiring between the intercom panel and
the individual receivers with shielded wire.

But first try something simpler - make sure all intercom wire
connections are clean and tight, and if there are any ground
connections, make sure they are secure.