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Photometric files and lighting calculations

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EULUMDAT, IES files, and how to compare offers.

Learning Track · Module 2: Luminaires · Step 12 of 101

Showing content for Europe. Change the region at the top of the page.

  • EULUMDAT (.ldt): common in Europe.
  • IES (.ies, IES LM-63): common in North America, and used widely in the Middle East and South Asia.

Compare offers fairly

  1. Give all suppliers the same road geometry: width, lanes, pole height, arm length, spacing, and setback.
  2. Give the lighting class and the maintenance factor.
  3. Ask for the calculation and the photometric file.
  4. Compare the power per kilometre that meets the class, not the power per luminaire.

Note

Ask for PDI and AECI from EN 13201-5 to compare designs on one number.

Sources

  1. IES LM-63 Standard file format for electronic transfer of photometric data
  2. EULUMDAT file format
  3. EN 13201-3 Calculation of performance
  4. EN 13201-5 Energy performance indicators

Changes: 30 October 2026: First publication: guides for Europe, the Middle East, South Asia, and the USA; failure library; tender clause library; comparisons; tools; downloads. See the changelog. Found a mistake? Report it.

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