Before we support luminaires in LBT, we’ll probably sooner enable you to plug Radiance Model folders into the LBT Honeybee Radiance recipes, which will provide a workaround for making this happen. You’ll basically be able to drop the .rad file created from the .ies definition into the scene subfolder of the Radiance folder. Then you’ll plug the path to the Model folder into the _model input of the recipe. I’m trying to have this implemented before the next stable release. You’ll know for sure if it’s been implemented when you see that this issue is closed: