Pillar guide

How to convert a 3D CAD model and IES file into a Revit file

To convert a CAD file to a Revit file for a luminaire, first export the simplified 3D model as text ACIS SAT 7.0 or 4.0, then pair that SAT with the matching IES in BIMMER. BIMMER builds and verifies a Revit 2025+ lighting-fixture family (.rfa). It does not directly accept STEP, SLDPRT or other native CAD files.

, lighting-product designer and BIMMER developer Updated

Direct support status

InputDirectly accepted?Required action
Text ACIS .sat geometryYesExport as a solid at ACIS 7.0 or 4.0; millimetres are recommended.
Binary ACIS .sab geometryNoRe-export or translate it to text ACIS SAT 7.0 or 4.0 first.
IES LM-63 photometryYesPair the IES with the matching luminaire geometry.
STEP / STPNoOpen, simplify and export the geometry to ACIS SAT before using BIMMER.
Native CAD such as .sldprt, .ipt or .3dmNoUse the CAD application or a suitable intermediary to export SAT first.

The BIMMER workflow

  1. Simplify the manufacturer CAD model to visible product geometry; remove tiny internal parts that add weight but no specification value.
  2. Put the light-emitting body first, preserve useful bodies separately, and export a solid text SAT at ACIS 7.0 or 4.0.
  3. Upload the text SAT and matching IES as one product row. Review extracted fixture parameters and generate.
  4. Download the .rfa and inspect orientation, dimensions, light source, photometric web, materials and schedule data.
Completed Revit lighting family with its photometric web
A BIMMER-generated lighting family opened in Revit with geometry and photometry together. See the complete BIMMER tutorial.

Geometry and photometry solve different parts of the job

The CAD model defines the visible luminaire shape. The IES file describes measured luminous intensity by direction. A usable Revit lighting family needs both: geometry for coordination and rendering, and a configured light source carrying the photometric web for calculations and visualisation.

BIMMER binds those inputs into a category-correct RFA rather than merely importing a shape. The output includes the light source and the product data BIMMER can extract or you enter.

CAD file to Revit family: what the conversion creates

“BIM file” and “Revit file” are broad requests. For Autodesk Revit, a reusable manufacturer product is normally delivered as a family file ending .rfa. BIMMER currently builds on the Revit 2025 engine, so the result opens in Revit 2025 and later, not Revit 2024 or older.

Common failures and what to change

A modern SAT produces no geometry in Revit.

Re-export at ACIS 7.0 or 4.0. A .sat extension alone does not prove the internal ACIS version is compatible.

The family is unnecessarily large or has fractured faces.

Remove screws, springs, wiring, fine threads and unseen internals; export clean solids rather than a manufacturing-detail assembly.

Photometry is attached at the wrong point.

Make the light-emitting body the first body in the source model and verify that the IES belongs to the exact product variant.

Questions manufacturers ask

Can an IES file be converted to Revit without CAD?

An IES can define a photometric light source, but it does not contain the luminaire housing geometry. The BIMMER workflow requires the matching text SAT geometry and IES together.

Does BIMMER convert STEP directly to RFA?

No. Convert or export STEP to a simplified ACIS SAT 7.0 or 4.0 first, then use that SAT with the IES in BIMMER.

Can BIMMER convert a 3D model to a Revit family?

Yes when the lighting-product geometry is prepared as text ACIS SAT 7.0 or 4.0 and paired with its IES. BIMMER returns an RFA family, not an RVT project.

Primary references