I have put interior partitions to simulate light shelves on view windows. These light shelves are intentionally angled such that they block all incident beam for all occupied hours.

There should still be reflected/redirected diffuse light that enters the space but the Radiance annual illumination results are showing very low illuminance levels (~2.0 - 100 lux) and 0 daylight autonomy.

I have tried modeling the light shelves both as a single surface with a single construction of a single material with a given reflectance and as two surfaces, on facing up and one facing down, same material and construction.