A Practical Guide to IES Light Profiles
Measured photometric files from lighting manufacturers that describe exactly how a real luminaire spreads light.
Imogen Clarke
Why does it matter?
IES profiles make architectural renders match the specified fixtures instead of generic soft lights.
What are the numbers?
- Photometric data IES files describe light distribution measured from real fixtures
- Manufacturers publish IES files for their products
- Renderers most support loading IES profiles on lights
- Intensity profiles describe shape, while intensity is set separately
What should I do?
- Use manufacturer IES files for specified fixtures
- Set intensity in real-world units where supported
- Check light patterns on walls and ceilings
- Keep a library of used profiles
- Record which fixtures each scene uses
What should I avoid?
Avoid:
- Generic lights for specified fixtures
- IES profiles at arbitrary intensities
- Mixing real and invented lighting without noting it
- Unlabeled profile libraries
When should I get help?
Short answer Bring in help when renders support lighting design decisions.
Where this comes from
- Blender Foundation — Blender Manual: Lighting
- Autodesk — Lighting analysis
The figures and practices above come from the sources listed.
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