you don't need to care about this as long as your light source emits a continuous spectrum. The MG-filtration is based on light blocking not on light passing. VC paper has two emulsion layers: a soft one and a hard one. The soft one is sensitive to green light and the hard one to blue light. A #5 filter blocks green light, regardless of the color temperature. But exposure correction factors do vary from light source to light source. The higher the color temperature, the less exposure correction is required for grades 4 and 5.