In practical use, one can assume that, under the relevant light-source and with any "Professional" film, you will end up with a neutral grey and optimum colour representation.

One then measures the light you are actually working in (assuming that it is a continuous spectrum source, else you'll need to test, spec-sheet or no), goes to the filter diagram and check how many mireds you need to shift and choose the appropriate filtration.

Working out the modification from first-principles, based on wavelengths and amplitude of radiation, seems somewhat inconvenient.