Narrowband trichromatic (RGB) light sources are recommended for scanning color negative film over broadband (white) light due to the better results achieved with RGB scans. Scanning film with an RGB light source eliminates the need for specialized software and produces high-quality images with minimal post-processing. The oversimplified explanation is that color negative film uses cyan, magenta, and yellow dyes to store an image, each dye absorbing specific wavelengths of light. Scanning film with white light can result in inaccurate colors and a need for extensive post-processing, while RGB scans provide a straightforward and effective solution. Building a custom RGB light source is a recommended option for achieving optimal results in film scanning.
https://jackw01.github.io/scanlight/