It is possible to have almost realistic vizualization of the WEGA-H-MODULE luminaire and also correct lighting results.

Insert one INDIRECT MODULE with the designed wattage in the room and put two DIRECT MODULES with the same wattage from each side next to it, so there will be 15mm gap between the sides of lamps. 
Next rotate the indirect type 180 in Y axis and move it 50mm lower than the direct types are.
You should get a realistic looking WEGA-H-MODULE lamp (see image from DIALux).

Or you can use the simplified LDT file in this ZIP archive.