Higher Resolution BSDF

I was wondering is there a way to increase the resolution of the output of the BSDF material. I generated an xml file that when light is perpendicular on the surface it behaves in a vertical linear direction using the klem patches, however this is not the case when I simulate it using radiance; the transmitted light has an abnormal behavior with light spots all over the receiving surface.
I was wondering if the problem is in the genBSDF line i wrote or the geometry I created for the bsdf of the geometry used in the simulation.
Here are some of the points I applied:
1. The genBSDF line:genBSDF.exe -c 16000 filename.rad > newfilename.xml
2.The surface geometry:0.1 x 0.1 x 0.01 [meters]
3. The simulation environment geometry:0.4 x 0.4 x 1 [meters]