Import Luminaire files .ies

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In a word, no. Since the OpenStudio Radiance support is focused on the daylighting and handles electric lighting as space loads only, there has not been any focus on getting the spatial photometric data into OpenStudio. One could write a measure to read in the pertinent luminaire data from a photometry (.ies) file and assign it to a luminaire object in the OpenStudio model, but the real fruit of such an effort would be to actually take the luminaire photometry, convert it to Radiance data format (easy), and add it to the Radiance simulation (not easy or fast).

So the bad news is that photometrically-accurate, luminaire-level Radiance simulation is not currently part of OpenStudio. The good news is that it is totally within the realm of possibility by leveraging the OpenStudio API and Measures framework (hint, hint).