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I see, so the L filter has a larger spectrum that the RGB combination. That's problematic. It also means that the gaps in RGB will be rendered as gray in LRGB processing. It seems like they combined a light pollution filter into the RGB set, but the L filter doesn't have that gap. Curious.
But at the end, L is not a channel in an RGB image. R, G, and B are. L is used to enhance an image with weak RGB channels, because we perceive resolution in the luminance of an image, but no so much in the chrominance. But if the goal is to have the best color accuracy, then it seems better to capture correctly exposed RGB channels, and then there's no reason to capture L, right? The luminance of the image will be good, if the color channels are good. Probably add Ha capture, if the red filter cuts this important line.
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