I hope I eventually can add something to the discussion once I finished my current project. I use tree-laser Optoma ML1080 video projector with actual RGB lasers. I switched projector in the mode where I can control each channel independently. I wrote application for PC which presents user with the panel with five sliders RGB, Alfa channel and vingnette simulation mode. So I can use video projector with narrow band lasers and control each channel independently. All of the above is done.
Here is the spectral distribution measured with Sekonic Spectromaster . I specifically tweaked intensity of each channel so they all have equal intensity. I can recreate any other specter distribution at will.
Now the whole exercise was meant to compensate for orange mask. Indeed I was able to put filter made from masked film leader and adjust intensity of RGB channels to return light back to the relative intensities shown above. So that part also works. I started to take pictures using back light described above and noticed that generally speaking the contrast of the images was much higher then usual. That’s all I can say for now as I need to build integrating sphere to properly mix light from projector before using it as backlight. That’s in process now. Will have more once I finished prototype. The RGB generator application is available on GitHub as open source, it can be used on any PC with two monitors or monitor and video projector. It might work on Mac as well as it is written in pure Python , I just never tested it on macOs.