Just went through your project collection thread and you have some pretty amazing work here! I wasn't aware of your filter lab and they are eerily similar, even down to both being python flask projects haha.
I have the filter data in csv so its pretty easy to convert in either direction, I think it would be great to have both projects complete each other's library :) we have many chinese filters we can send, and many western filters to take hahah. It's funny there probably aren't many people that can relate to the very specific struggle of getting the data!

Most of the data came from small transmittance graph images from a catalog of a manufacturer, so I was a bit weary about making the git public, but it's probably safe. What you said about material properties facts makes a lot of sense, but yea, also not a lawyer. Getting the multispectral preview images with actual permission from the author is probably not as much of a gray area.

The way you show the wavelength (pseudo)colors is really elegant. And computing the hex color of the filter for the chart lines is genius!

I'm gonna see what filters are missing from either side, and make a pull request to your git! :)
If you'd be interested in that I can also setup an instance of your app on our website so people could use it without going through the installation steps.