For decades, DIALux 4 was the standard. However, it operated as a 2D calculation tool with a 3D visualization layer added on top. The modern (the current standard for professionals) is a native 3D BIM software. It models the physics of light in a true 3D environment, accounting for inter-reflections between surfaces, volumetric scattering (fog), and complex geometry.
To leverage the "Pro" side of DIALux, one must follow a structured workflow: dialux pro full