Do a search on this site on light pollution filters and you should pull up some more exhaustive comments than I will provide here (I've got to run some errands so says my wife)...
I have owned and used light pollution filters (as well as others)...
Bottom line is that "technically" they will work and block out light pollution...however, I think largely that the money spent on a filter is better spent on petrol to get to a dark sky spot...
A UHC filter will also work but will be a bit more "severe" than just a single purpose LPF...
In a nutshell, use your new filter first and see what you think of that before buying a LPF too.
No filter will equal (or come close to in my opinion) a dark sky.
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