Global Lighting Data Format

Standardised data format for the lighting industry

GLDF-Checker – free tool

With this free tool, you can check the data contained in your GLDF file. You can analyse the fill level of the native GLDF properties and compare what kind of application it supports: GLDF-Checker.


  GLDF demo package

In our GLDF demo package, you will find a wide variety of GLDF files covering various applications.

Download demo package as .zip [2.2 MB]

Structure and content of the GLDF  

GLDF is an open, free format that can be used across the entire lighting industry and meets the latest BIM process requirements. Manufacturers, planners and even software manufacturers can benefit from this new format.


Commercial data
Photometric and radiometric data
BIM characteristics to CEN/TS 17623
Individual and parametric geometric data
Mapping of real product variants
Who is compilling and maintaining GLDF?

Relux and DIAL are developing and maintaining the format.  

It is not legally possible to take out a copyright on a data format, nevertheless Relux and DIAL are jointly maintaining this data and geometry format.

The GLDF XSD is published under MIT license, it remains free and open to all private and commercial usage.

Is GLDF free of charge and who is entitled to use it?
The format specifications, along with sample files and libraries for both reading and writing, are freely available, complete with source codes, for use by anyone. Additionally, free reader and editor applications will be supplied to all those interested. .

Status of the GLDF format  

FUN with RELUX – Episode 14  


Technical details of GLDF

This PDF contains an article of the LICHT2023 conference proceedings with more details of GLDF.
Only available in German.

Download PDF Article LICHT 2023 [1 MB]

More about GLDF

The website contains a description of the latest version of the format as well as tools,
sample files and the opportunity to enter suggestions and comments.
This website is operated jointly by the two companies DIAL and Relux.



Are you interested in more information about GLDF?
Please contact us.