I see your point.
However, I've decided to give it a try since:
- I have no other way to fine tune light output at this time (I don't have a Vc head).
- Adjustments will be minor - say +/- 0.5 f stops.
- If you take the spectrum of an incandescent lamp and of a cold light source, they are quite different, but there are no different VC filters for each of these light sources, so maybe that's not a major issue.

Next time I do prints I will let you know.

Jorge O