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Hi Stephane
I am looking into filters for the same purpose as well.
As I understand it, the UV/IR may be required (mainly to filter out IR that you don't want). If you are using a refractor, that will come to focus at a different point. Other filters may also remove the IR.
A UV/IR will not help with light pollution.
I think a broadband filter is more like theOptolong L-Pro. I am not recommending this, as I am currently far too ignorant about filters.
I will be doing some reading soon, and am looking forward to the answers others give.
Philip
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