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Julian,
I have an Orion Skyglow Broadband Filter. It blocks the most common light pollution (e.g. street lights) but allows Hydrogen Alpha & Beta and double ionized Oxygen (OIII). I find the filter improves contrast between the sky and the object by darkening the background. Works well on bright nebulae like the Orion Nebula, Lagoon, eta Carinae Nebula, Tarantula, Dumbbell.
It won't make the object brighter. So it is not much use for dim objects e.g. most galaxies.
Regards, Rob.
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