The UVR Light Settings component enables you to define the polarization of the light : 

• For lights of type "Point", the polarization can be defined with the reduced Stokes vector,

• For lights of type "Directional", the polarization can be defined with the reduced Stokes vector or with {degree, ellipticity, orientation} properties,

• For lights of type "Area" or "Spot", the polarization can be defined with the reduced Stokes vector or with a measure.

See the Polarization section for more details on polarization.