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

Insert one DIRECT MODULE with the designed wattage in the room and put two INDIRECT 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 ones 180 in Y axis and move them 50mm lower than the direct one is.
You should get a realistic looking WEGA-G-MODULE lamp (see image from DIALux).

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