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Light pollution filters are not for planetary viewing. These filters are made to transmit very specific wavelengths of light at which certain nebulae types glow at but absorb all other frequencies of light so to increase contrast with said nebulae.
The thing about the planets and the Moon is you don't need to be under a dark sky to view them as they are sufficiently bright. Also, because they glow across the entire spectrum, light pollution filters are not going to help.
What CAN help are colour filters to show up certain filters with different planets. But these are still a double edge sword as the features they can help bring out won't necessarily make these features jump out to be plainly obvious. Some planetary features are vey low contrast and a colour filter will only help to show them up just a little bit easier.
The chart below shows what the different colour filters are best suited to show according to the different planets and Moon. Note that while this Orion filter set is no longer available, the information in the chart is still current as these colour filters are all made to the Kodak Wratten standard.
NOTE!!! 1
Many places sell colour filter sets with only deep colours. DO NOT BUY THESE! Such sets are designed to sell to chumps who have no clue about what colour filters are for or what they are supposed to show. The majority of filters that are useful are actually subtle in their colour density with those deep colour filters having very limited applications and in reality have little practical use for what people actually want. Look for places/sites that offer individual colour filters and have a wider range of colours than just four as this way you will be able to select and buy what will actually best work for you.
I do happen to have the Orion Planetary Filter Set noted in the chart below. It really is an extraordinary bit of kit but it really is VERY specialised. Many of these filter get little use with there being just a few that you will use a lot. You don't need all of these filters but maybe two or four. Once you get your experience up you might like to get a few more filters.
NOTE 2,
Aperture is King with astro. Not only will this show fainter stuff but resolution also increases. This is particularly important with the Moon and planets. The larger the aperture the finer the detail you will be able to see and better these filters will work.
But to get you started, I would suggest the 80A for the planets and the 82A for the Moon. These are by far the filters I most use with the planets and Moon. With your 5" scope, these filters will serve you very nicely. With the 80A I was able to see subtle clouds on Mars and helped lift the Great Red Spot which is very soft at the moment.
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