The Mac OS software Millumin gained support for (advanced) light fixtures in version 3. The fixture format is essentially the OFL format at schema version 7.3.0, with a few additions.
Copy the exported fixtures into the library folder and restart Millumin. For more information, see the Millumin Help link.
Fixture files in subdirectories are recognized.
Additions to the OFL format at schema version 7.3.0
- New top level properties
Cold Whitecolors (from schema version 11.1.0)