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Yes, the Radiance implementation of shading devices is simplified somewhat. Radiance will use one of four standard BSDF files to model the effect of blinds/shades/EC glazing/daylight redirection devices. As such, any changes to e.g. the blind slat configuration will not have any effect on the simulation. In the case of blinds, the "standard BSDF" is of a venetian blind with its slats set to block all direct sun.

See this UH Post and this page in the docs for more info.