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I'd generally agree with Theo.. for anything that emits light in broad spectrum, eg galaxies, reflection nebula, clusters etc take the LPS filter off under dark skies or you are losing light. You can prove this easily with a few quick test shots.
For some emission nebula, the LPS can still be beneficial, especially if you are shooting a little lower toward the horizon where the filter can help to reduce sky glow etc.
I also find when taking wide-field images of the milky way with modified cameras that using the LPS filter helps to produce a more natural colour balance in the final image and to enhance red emission nebula.
Phil
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