Convert IES to STP

Understanding IES and STP file formats

IES files are photometric data files created by the Illuminating Engineering Society. They contain information about the light distribution of a luminaire, used in lighting design and simulation software. STP (or STEP) files, on the other hand, are 3D CAD files that follow the ISO 10303-21 standard. They are used for exchanging 3D models between different CAD programs.

Why convert IES to STP?

Converting an IES file to an STP file allows lighting designers and engineers to visualize the light distribution as a 3D solid or surface in CAD software. This is useful for integrating lighting data into architectural or engineering models.

How to convert IES to STP

Direct conversion from IES to STP is not natively supported by most software, as they serve different purposes. However, specialized lighting design software can interpret IES data and export a 3D representation as an STP file. The recommended workflow is:

1. Import the IES file into a lighting simulation or visualization tool such as DIALux or AGi32.
2. Generate a 3D photometric solid or surface based on the IES data.
3. Export the 3D model as a STP file if the software supports it, or export as a compatible 3D format (like OBJ or DXF) and convert to STP using a CAD program such as FreeCAD or Autodesk Fusion 360.

Recommended software for IES to STP conversion

• DIALux: Import IES, create 3D models, and export geometry for further conversion.
• AGi32: Advanced photometric visualization and export options.
• FreeCAD: Import 3D geometry (OBJ, DXF) and export as File → Export → STEP.
• Autodesk Fusion 360: Import 3D files and export as File → Export → STEP.

Step-by-step conversion example using FreeCAD

1. Use DIALux or AGi32 to import your IES file and export the 3D geometry as OBJ or DXF.
2. Open FreeCAD and import the exported 3D file (File → Import).
3. Convert the mesh to a solid if necessary (using Part → Create shape from mesh).
4. Export the solid as a STP file (File → Export → STEP).

Conclusion

While there is no direct one-click solution for converting IES to STP, using lighting simulation software in combination with CAD tools like FreeCAD provides a reliable workflow for integrating photometric data into 3D CAD environments.