Dana,
Have you done any research with colored films or theatrical gels and sunlight?
I have 2- 4x4' sheets of 3/8" Starphire that I'd like to build a large skylight with, and possibly use gels to "tune" the light for better color.
Do you see any drawbacks?
Thanks for sharing all of your research, and taking time to communicate with those of us with a lot to learn
!
Chris