The latest Kdenlive development version now has a built in feature to
download new transition luma files.
So now if you want to share your lumas, upload them to
http://www.kde-files.org and they will be available to Kdenlive users
within a few minutes !
I added basic instructions on how to create and upload you luma files on
The idea is to have only a limited number of luma transitions in the
basic Kdenlive package so that it keeps a reasonable size. Then, users
can easily install the one they want with the new download feature.
(Attached screenshot of the new Kdenlive "Get new luma transition"