DIALux

DIALux is a free, professional lighting design software used to plan, calculate, visualize, and document indoor and outdoor lighting projects. Originating from the German company DIAL GmbH, it has become a widely adopted tool in the architectural lighting industry for creating lighting schemes that meet design goals, codes, and energy targets.

The software supports creating project geometry by building rooms and spaces or by importing CAD data in formats such as DWG and DXF. It provides access to extensive luminaire libraries containing manufacturer photometric data in IES and EULUMDAT formats. Users place luminaires, assign materials, and run calculations to determine illuminance, luminance, glare (UGR), and energy consumption.

DIALux offers both indoor and outdoor lighting capabilities, including daylight simulation in its newer evo versions. Daylight calculations use advanced engines to assess lighting performance under natural light, complementing artificial lighting design. Results can be visualized in 2D and 3D views, graphs, and rendered images, and can be compiled into professional reports.

Different versions exist, with DIALux evo being the current major platform that supersedes earlier DIALux 4.x releases. The software is distributed free of charge for professional use and is primarily designed for Windows operating systems. It supports ongoing updates from the developer and manufacturer catalogs, and is widely used to support compliance with standards such as EN 12464-1 and related regional requirements.