Manav,
Nope, not at all. The colour of the flats is not an issue.
Samir is an advocate for short exposures and lots of them. I disagree with that. If you want nice images, take long exposures, and lots of them.
Of course, going to dark sites helps infinitely more so, but, that still shouldn't stop you from capturing photons from a light polluted site.
H
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