
While DIALux 4.3 is an extremely old version of the software, it is no longer officially supported or promoted by the developer, DIAL. The current industry standard is DIALux evo 13, which is available for free for personal, educational, and commercial use.
If you specifically require an older version (often for hardware compatibility or legacy features like sports lighting calculation frames), you can use the following third-party sources or archived links. DIALux 4.x Download Options dialux 43 download link
DIALux is the global standard for professional lighting design. Developed by DIAL GmbH in Germany, it allows users to plan, calculate, and visualize light points in indoor, outdoor, street, and emergency lighting scenarios. While DIALux 4