Relux

Relux is a commercial lighting design and simulation software package used by architects, lighting designers, and engineers to plan and verify interior lighting and daylight performance. It is developed by Relux Informatik AG and distributed internationally, with a focus on European markets.

Core features include a 3D workspace for space modeling and luminaire placement, a library of luminaires and daylight data, and support for importing photometric data in standard formats such as IES and EULUMDAT. Relux provides daylight simulation using sun position data and climate information, along with calculations for illuminance, luminance, glare indices, and energy consumption. The software also offers high-fidelity rendering for visualization and built-in reporting and export capabilities to support presentation and documentation.

The program is used across various design contexts, including offices, retail spaces, and industrial environments. It supports daylighting studies, energy efficiency assessments, and compliance with applicable lighting standards. Relux also aims to integrate with common CAD and BIM workflows, facilitating data exchange with other design tools and project teams.

Relux originated in the 1990s as a PC-based tool developed by Relux Informatik AG and has since evolved into a broader suite with enhanced rendering, daylight analysis, and data libraries. It has established a strong presence in European markets and remains a widely used option for professional lighting design and verification.

Relux is proprietary software offered under commercial licenses, with options for professional use, educational licenses, and trial access. Documentation, training resources, and customer support accompany its deployment.