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IES File - What is a .ies file and how do I open it?
Learn about .IES files and view a list of programs that open them.
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What is a IES file? An IES file is a plain text file that contains measurements of light and light quantities. It is saved in a format specified by the Illuminating Engineering Society (IES). Building designers and civil engineers use IES files to simulate lighting systems while designing buildings, roadways, parks, and other structures.
More Information IES file open in Apple TextEdit Lighting manufacturers commonly create and publish IES files that designers and engineers can use to model how a lighting system behaves. These files describe how a lighting installation's light moves throughout a room or other area. Many architectural programs that can simulate lighting, such as Autodesk Revit, allow engineers and designers to load IES files and use them in their models. Some interior design and 3D art programs also support IES files.
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DeveloperIlluminating Engineering Society
Popularity3.1 | 16 Votes
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.IES File Extension
IES Photometric Data File
| Developer | Illuminating Engineering Society |
| Popularity |
3.1 | 16 Votes |
What is a IES file?
An IES file is a plain text file that contains measurements of light and light quantities. It is saved in a format specified by the Illuminating Engineering Society (IES). Building designers and civil engineers use IES files to simulate lighting systems while designing buildings, roadways, parks, and other structures.
More Information
IES file open in Apple TextEdit
Lighting manufacturers commonly create and publish IES files that designers and engineers can use to model how a lighting system behaves. These files describe how a lighting installation's light moves throughout a room or other area.
Many architectural programs that can simulate lighting, such as Autodesk Revit, allow engineers and designers to load IES files and use them in their models. Some interior design and 3D art programs also support IES files.
How to open a IES file
You can use an IES file to simulate a light source in 3D modeling tools like Autodesk Revit LT (Windows), Autodesk AutoCAD (Windows, Mac), and Acuity Brands Lighting Visual Lighting (Windows).
To view the lighting information an IES file contains in an organized format, open the file in IESviewer (Windows), jSolutions Inc. Photometrics Pro (Windows), or Acuity Brands Lighting Visual Photometric Tool (Web). You can also open an IES file in any text editor, such as Microsoft Notepad or Apple TextEdit , to quickly view the plain text data it contains.
How to convert a IES file
You can use the PhotoView module included in OxyTech LITESTAR 4D Open to convert IES files to the following formats:
You can use the online Eulumdat Tools IES to ELUMDAT Converter to convert IES files to the LDT format.
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Programs that open IES files
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Windows
Autodesk Revit LT 2022
Free Trial
Autodesk AutoCAD 2025
Free Trial
Acuity Brands Lighting Visual Lighting
Free Trial
OxyTech LITESTAR 4D Open
Free
Meduza Photometric Toolset
Free Trial
Any text editor
Mac
Autodesk AutoCAD 2025
Free Trial
Any text editor
Web
Acuity Brands Lighting Visual Photometric Tool
Free
Eulumdat Tools IES to ELUMDAT Converter
Free
Category: Data Files
Updated: April 13, 2022