The Relux raytracing module has a "Raster measuring areas" dialog for calculating luminances or illuminances. 

This dialog is used in the same way as in ReluxDesktop calculations.

The measuring surfaces contained in the project are listed in the dialog, and the basic settings are shown 

for the number of points in the X and Y direction, together with the corresponding intervals between the points.

Pressing the '...' button will activate the extended dialog for selecting the additional "vertical illuminances".

Calculation Manager (Calculation parameters)