I use at work a mxscript which renders and save for each lightgroup (instanced lights) one hdr image for further manipulation with Vivaldi. It's a software for lighting designers, which "composes" light like maxwell multilight, but you can load HDR Images rendered by any software.
most of the time i have 4-5 groups of instanced lights and 2-3 variations with different ies lightdistribution files.
