Hi @vasei, unfortunately the Honeybee Python API does not have a class for ies2rad at present.
So, if you want to run everything within the Python commandline, you’d have to send system calls (os.system) to ies2rad and then move things around using xform. That’s pretty much what we do in the Legacy version of Honeybee.
If you want a somewhat more Pythoninc workflow, (and are feeling also a bit adventurous 
,) you can create a class for Ies2rad by inheriting from RadianceCommand and then do without the system calls. I would recommend against this in case you are just looking to solve a one-time problem.
Regards,
Sarith