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The L-extreme filter lets through a narrow part of the light spectrum. It lets through the emissions from Hydrogen alpha which is part of the red end of the spectrum and OIII which is in the green part. The green in the image will be either OIII emissions which can get through unhindered (lots of OIII is a feature of this target) or 'stray' light e.g. I think a small fraction of the white light spectrum would come through (there is plenty of light pollution here) but it would appear either red or green.
For most targets there is very little OIII present and I don't get much green in those situations....
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