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Simulation Inaccuracy in Lighting Design Caused by Geometric Assumptions in Luminaire Data.

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Title: Simulation Inaccuracy in Lighting Design Caused by Geometric Assumptions in Luminaire Data.
Authors: Mokran, Marek1 (AUTHOR), Kompan, David1 (AUTHOR) david.kompan@stuba.sk, Janiga, Peter1 (AUTHOR), Dubnicka, Roman2 (AUTHOR), Gasparovsky, Dionyz3 (AUTHOR)
Source: Leukos. Jul2026, Vol. 22 Issue 4, p485-515. 31p.
Subjects: Lighting design, Computer simulation, Photometry, Luminance (Photometry)
Abstract: Accurate lighting simulations are essential for designing electric lighting systems that meet visual comfort, energy efficiency, and regulatory standards. A key limitation lies in standard photometric file formats such as Eulumdat and IES, which often simplify luminaire geometry by assuming idealized shapes or point source behavior. These simplifications overlook spatial complexity and can result in significant errors, particularly in near-field conditions. This study investigates the influence of geometric assumptions in photometric data on the accuracy of lighting simulations. Laboratory measurements were performed on three types of luminaires: linear, square, and multi-source. Illuminance values were recorded with a calibrated luxmeter in a photometric laboratory, with the luminaire mounted in a fixed position, then compared with theoretical calculations and simulations produced by widely used lighting simulation softwares. The results show that deviations between simulations and real measurements remain within 2–6% for compact symmetric luminaires. However, in luminaires with multiple spatially separated emitting areas, simulation errors exceeded 30% at short distances. Discrepancies were more pronounced at off axis positions and in close proximity to the luminaire, highlighting the limitations of oversimplified photometric models. These findings emphasize the need to consider the limitations of photometric formats when modeling geometrically complex luminaires. Designers should be aware of possible inaccuracies in near field regions and reflect this in the design process. Improved photometric data formats and enhanced simulation algorithms are necessary to more accurately represent real lighting behavior and to ensure dependable design outcomes. [ABSTRACT FROM AUTHOR]
Copyright of Leukos is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Simulation Inaccuracy in Lighting Design Caused by Geometric Assumptions in Luminaire Data.
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  Data: <searchLink fieldCode="JN" term="%22Leukos%22">Leukos</searchLink>. Jul2026, Vol. 22 Issue 4, p485-515. 31p.
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  Data: <searchLink fieldCode="DE" term="%22Lighting+design%22">Lighting design</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Photometry%22">Photometry</searchLink><br /><searchLink fieldCode="DE" term="%22Luminance+%28Photometry%29%22">Luminance (Photometry)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Accurate lighting simulations are essential for designing electric lighting systems that meet visual comfort, energy efficiency, and regulatory standards. A key limitation lies in standard photometric file formats such as Eulumdat and IES, which often simplify luminaire geometry by assuming idealized shapes or point source behavior. These simplifications overlook spatial complexity and can result in significant errors, particularly in near-field conditions. This study investigates the influence of geometric assumptions in photometric data on the accuracy of lighting simulations. Laboratory measurements were performed on three types of luminaires: linear, square, and multi-source. Illuminance values were recorded with a calibrated luxmeter in a photometric laboratory, with the luminaire mounted in a fixed position, then compared with theoretical calculations and simulations produced by widely used lighting simulation softwares. The results show that deviations between simulations and real measurements remain within 2–6% for compact symmetric luminaires. However, in luminaires with multiple spatially separated emitting areas, simulation errors exceeded 30% at short distances. Discrepancies were more pronounced at off axis positions and in close proximity to the luminaire, highlighting the limitations of oversimplified photometric models. These findings emphasize the need to consider the limitations of photometric formats when modeling geometrically complex luminaires. Designers should be aware of possible inaccuracies in near field regions and reflect this in the design process. Improved photometric data formats and enhanced simulation algorithms are necessary to more accurately represent real lighting behavior and to ensure dependable design outcomes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Leukos is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1080/15502724.2025.2577328
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      – Code: eng
        Text: English
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        PageCount: 31
        StartPage: 485
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      – SubjectFull: Lighting design
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Photometry
        Type: general
      – SubjectFull: Luminance (Photometry)
        Type: general
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      – TitleFull: Simulation Inaccuracy in Lighting Design Caused by Geometric Assumptions in Luminaire Data.
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              M: 07
              Text: Jul2026
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              Y: 2026
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