What Is Dialux? Dialux is a professional, free lighting design software widely used by lighting designers, architects, and engineers. It allows users to plan, calculate, and visualize indoor and outdoor lighting systems according to international standards (e.g., EN 12464). The software is developed by Dial GmbH (Germany). The Version 13.0 Question As of early 2025, the current stable release from Dial is Dialux 4.13 or Dialux 4.13.x (the 4.x series). There is no official “Dialux 13.0” released by Dial GmbH.