Question concerning this fx shot in a music video...

That's kind of a loaded question.
Sorry for babbling on a bit...

Generally speaking, imo, the effect would be created with the intent of handing it off to a third party for final editing.
In that case the effect would have to be something that the editor could 'drop in' to the video and have all of the masking/rotoscoping already taken care of.

The light color would probably be white regardless of the desired color simply because white contains an even number of rgb values that are easier to add or subtract from to get your desired color.
For example, if you render your light red before you send it off, then the editor can't make it blue now because the blue color channel information isn't there. So white is best if your planning on post CC'ing the color.
Multipass rendering comes in here as well for sake of the converstation.

I suspect you know this already.

So, the effect composite would be handed off, with alpha(s), to the editor.
At that point, he drops it into the video. Then he can CC the video and adjust the CC of the effect afterwards to match.

You 'could' precomposite the effect into the video as close as possible with or without colored light and CC that whole thing over again. That doesn't make it right or wrong.
It's more a matter of choice. But the proper way imo would be the first method.

I've handed VFX composites off to editors before 'expecting' them to CC it to match the footage, because there is no way I could know what they have planned for the final CC.
Only to find they never CC'd my VFX to match thier video. One qoute was "We didn't want to touch it." Gasp. Point is the workflow should be discussed ahead of time with your client if that's the situation.

Just my 2 cents. Other people know more about this than me, so...

Good question though.
 
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