.ELD File Extension

Eulumdat Formatted Luminaire Data File

Developer DIAL
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What is an ELD file?

An ELD file contains plain text luminaire (light fixture) data formatted for use with DIAL DIALux, a professional lighting planning application. It defines a light fixture's intensity, light distribution curve, size, and number of lamps. The data ELD files contain is saved in DIAL's proprietary Elumudat format.

More Information

Screenshot of a .eld file in Microsoft Visual Studio Code
ELD file open in Microsoft Visual Studio Code

DIALux allows lighting designers to model how the light installations included in a house, office building, neighborhood, or other environment will behave. To simulate a light source, designers import an Elumudat-format data file that describes the light source's characteristics and behavior. Lighting installation manufacturers often create these data files and provide them to lighting designers, for use in DIALux.

On rare occasions, Elumudat data files may be saved with the .eld extension. More commonly, these files are saved with the .LDT extension. Most programs that use Elumudat-format files do not recognize the .eld extension. Therefore, you should likely rename your ELD file to use the .ldt extension, so you can open it more easily.

How to open an ELD file

Before attempting to open an ELD file, you should rename it to use the .ldt extension. This will allow you to open the file in programs that support the Elumudat format, such as DIAL LDT Editor (Windows), Meduza Photometric Toolset (Windows), and DIAL DIALux Evo (Windows).

Opening an ELD file in a text editor

Alternatively, you can open an ELD file in Microsoft Notepad, Apple TextEdit, or any other text editor, to view the plain text data it contains. However, it's far better to open an ELD file in LDT Editor or another program that shows the file's data in an understandable format.

How to convert an ELD file

After renaming your ELD file to use the .ldt extension, you can convert it to other formats using either the PhotoView module included in OxyTech LITESTAR 4D Open or the online Eulumdat Tools ELUMDAT to IES Converter tool. LITESTAR 4D Open can convert LDT files to the following formats:

  • .IES - IES Photometric Data
  • .LTL - Luminaire Data
  • CIE - International Commission on Illumination Data

Eulumdat Tools ELUMDAT to IES Converter can convert LDT files to the IES format.

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Programs that open ELD files

All Platforms
Rename .eld extension to .ldt, then open in a program that supports LDT files

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