It seems you are looking for a β a specific older version of the free lighting design software from DIAL GmbH.
: You can easily import luminaire data by downloading IES or ULD files from manufacturer websites and using the "drag & drop" feature. Troubleshooting dialux 43
Assign textures and reflection factors to walls and floors. If you leave them at default grey, your results might be lower than in reality because of low light bounce. 5. Running the Calculation guide for DIALux 4