This is a very low cost solution we have used in an historic house used as
exhibit space (historically furnished) and primary collection storage area.
We have left on single incandescent light bulb and hung fly strips by them
and trapped millions of flies and some dermestids.  Unfortunately we have an
infestation of both in this historic home - just one of many things we do to
try and control problem.  Please let me know if you come up with other
helpful information.