If you have a ColourChecker type of chart, you could film a short bit with that in frame. I haven't tried that myself, though[..]
For stills, I almost always shoot Raw, so I am spoiled by the after-the-fact color control I have with ACR. I did one half-hearted attempt at a custom color balance from shooting a white sheet of paper under the lights. Results didn’t seem any better than what I got from auto. Maybe a gray card would work better.
[..]
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