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Hi Adrian,
I have had the opportunity to own and try several light pollution filters. The general broadband filters like Orion SkyGlow (I owned one of this in the past) and Lumicon DeepSky are less useful for visual use but extremely useful for astrophotography. The narrow bandpass filters such as the Lumicon UHC (ultra high contrast), DGM Optics NPB (narrow passband filter), DGM Optics VHT (very high throughput, an in between filter between broadband and narrow passband) are better in this respect. I own all three of the mentioned. Other notable narrow pass band filters include Astronomiks UHC (John (Bambury) can chip in here) and Orion's UltraBlock. I have had some astonishing views of nebulae and they do make a lot of difference from cities and suburbs. I have also tried line filters such as the Astronomiks OIII (thanks Andrew...astro_south) and while these are great for planetary nebulas, they dim the views too much (unless you have a light bucket dob). If there was only one filter to get it would be a narrow passband filter.
Darren
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