What is an IES file?

How to open, edit and convert IES files

An IES file extension file is an IES photometric file that stands for Lighting Engineering Society . These are simple text files that contain light data for architectural programs that can simulate light.

Lighting manufacturers can publish IES files to describe how their products are affected by different structures. A program that uses an IES file can interpret this to understand how to show the right light patterns in things like roads and buildings.

How to open an IES file

IES files can be opened using lighting analysts’ photometric toolkits, Autodesk architecture and Revit software, RenderZone from AutoDesSys, AcuityBrand’s visual lighting software, and LTI Optics Photopia.

Note. If you need help using an IES file in Revit, see the Autodesk tutorial on how to set an IES file for a light source.

The IES file can also be opened via the free IES Viewer as well as AcuityBrand’s visual photometric tool.

A simple word processing program, such as Notepad for Windows or one of our best lists of free text editors , can also open IES files because the files are in plain text. Doing so lets you see a visual representation of the data, but the content of the text.

Note: ISE files share the same letters as the file with the .IES extension. However, the ISE files are either InstallShield Express Project files or Xilinx ISE Project files; they open in InstallShield and ISE Design Suite, respectively. The EIB file extension is similar, but instead of the image files created by Capture One.

If you find that an application on your computer is trying to open an IES file, but it’s the wrong application, or if you want to use another installed program to open an IES file, see our How to change a specific file extension guide to the default program for this change in Windows.

How to Convert an IES File

With this Internet converter, you can convert an IES file to an EULUMDAT (.LDT) file. You can also do the opposite and convert LDT to IES. Eulumdat tools should be able to do the same thing, but it works on your desktop instead of a web browser.

PhotoView is not free, but you can convert IES files to formats such as LDT, CIE, and LTL.

The free IES Viewer mentioned above can save the file to BMP.

Although this is probably not helpful, you can convert the IES file to another text-based format using Notepad ++ mentioned above.

The free DIALux program can open ULD files, which are Unified Lighting Data Files – a format similar to IES. You may be able to import the IES file into this program and then save it as a ULD file.

Learn more about IES

The IES file format is called because of the lighting society. In order to better shape lighting conditions in the real world, there is a society that brings together lighting experts (eg lighting designers, consultants, engineers, sales representatives, architects, researchers, lighting equipment manufacturers, etc.).

It is the IES that has ultimately influenced the creation of various standards for some lighting applications, such as those used in healthcare facilities, sports, offices, and so on. Even the National Institute of Standards and Technology has referred to IES publications Optical Radiation Calibration.

IES in The Lighting Handbook: The 10th edition is an authoritative reference to lighting science.

More help with IES files

Contact social networks or email, post in technical support forums, and more for more information. Let me know what problems you are opening or using the IES file and I will see what I can help with that.


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