You should be able to import and apply IESNA photometric data (.ies) to Autodesk Revit and use it on a new or existing model. This looks more like a workflow than conversion thought, so ies to rfa conversion may not actually be possible.
Convert IESNA photometric data file to Autodesk Revit Architecture family data.
We found one software available in the database for this conversion.
Microsoft Windows software - convert ies to rfa on Windows
A building design software from Autodesk
Convert from ies file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.