A great question Kevin - I would also like to know people's experiences with LRGB. My guess is at least 5-10 hours of Lum would be desirable, depending of course on how dark the site is.
I think that RGB data, as long as it has decent SNR, might also be included in the process of making of the Luminance (combining Lum master and RGB masters to make an improved Lum in terms of SNR).
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