Hi @ivylili ,
From past experience, I know that you can check and match your Radiance parameters between Pollination and IES. They might be using different default numbers for multiple parameters. We did a comparative study for DF, UDI and sDA with IES, Pollination and LB-HB Legacy. In a nutshell, the results were pretty much close to one another after making sure that we did enter the identical inputs with identical simulation settings.
Thanks,
Levent