Beat Flicker – A Temporal Light Artefact due to Multiple Sources of Time Modulated Light

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Abstract

Metrics of temporal light artefacts (TLAs) are tools meant to quantify the magnitude of the impact of temporal modulated light generated by light sources. However, as lighting systems are becoming more and more complex, just assigning a TLA metrics to a light source is not necessarily an easy task. For example, a luminaire containing two drivers operating on slightly different frequencies could generate a light intensity waveform, resulting in some TLA values at one moment, and different TLA values at another moment. In acoustics, the corresponding phenomena would be two tones with slightly different frequencies, giving rise to something called “beats”. The authors of this paper therefore calls the “light”-version of this phenomena beat flicker. The objective of the present work is to draw attention to a challenge that might arise, when assessing temporal modulated light, using tools currently available. The presence of beat flicker could be such a challenge to handle.
Original languageEnglish
Title of host publicationProceedings of the 29th CIE SESSION
Number of pages9
PublisherCIE - International Commission on Illumination
Publication date2019
Article numberPO079
DOIs
Publication statusPublished - 2019
EventCIE 2019 29th Quadrennial Session - Washington DC, United States
Duration: 14 Jun 201922 Jun 2019
http://washington2019.cie.co.at/

Conference

ConferenceCIE 2019 29th Quadrennial Session
CountryUnited States
CityWashington DC
Period14/06/201922/06/2019
Internet address

Keywords

  • Flicker
  • Temporal Light Artefacts
  • Temporal Modulated Light
  • Stroboscopic effects
  • Stroboscopic Visibility Measure
  • Flicker Index
  • Modulation depth
  • Multiple sources
  • Beat Flicker

Cite this

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title = "Beat Flicker – A Temporal Light Artefact due to Multiple Sources of Time Modulated Light",
abstract = "Metrics of temporal light artefacts (TLAs) are tools meant to quantify the magnitude of the impact of temporal modulated light generated by light sources. However, as lighting systems are becoming more and more complex, just assigning a TLA metrics to a light source is not necessarily an easy task. For example, a luminaire containing two drivers operating on slightly different frequencies could generate a light intensity waveform, resulting in some TLA values at one moment, and different TLA values at another moment. In acoustics, the corresponding phenomena would be two tones with slightly different frequencies, giving rise to something called “beats”. The authors of this paper therefore calls the “light”-version of this phenomena beat flicker. The objective of the present work is to draw attention to a challenge that might arise, when assessing temporal modulated light, using tools currently available. The presence of beat flicker could be such a challenge to handle.",
keywords = "Flicker, Temporal Light Artefacts, Temporal Modulated Light, Stroboscopic effects, Stroboscopic Visibility Measure, Flicker Index, Modulation depth, Multiple sources, Beat Flicker",
author = "Johannes Lind{\'e}n and Carsten Dam-Hansen and Anders Thorseth",
year = "2019",
doi = "10.25039/x46.2019.PO079",
language = "English",
booktitle = "Proceedings of the 29th CIE SESSION",
publisher = "CIE - International Commission on Illumination",

}

Lindén, J, Dam-Hansen, C & Thorseth, A 2019, Beat Flicker – A Temporal Light Artefact due to Multiple Sources of Time Modulated Light. in Proceedings of the 29th CIE SESSION., PO079, CIE - International Commission on Illumination, CIE 2019 29th Quadrennial Session, Washington DC, United States, 14/06/2019. https://doi.org/10.25039/x46.2019.PO079

Beat Flicker – A Temporal Light Artefact due to Multiple Sources of Time Modulated Light. / Lindén, Johannes; Dam-Hansen, Carsten; Thorseth, Anders.

Proceedings of the 29th CIE SESSION. CIE - International Commission on Illumination, 2019. PO079.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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AB - Metrics of temporal light artefacts (TLAs) are tools meant to quantify the magnitude of the impact of temporal modulated light generated by light sources. However, as lighting systems are becoming more and more complex, just assigning a TLA metrics to a light source is not necessarily an easy task. For example, a luminaire containing two drivers operating on slightly different frequencies could generate a light intensity waveform, resulting in some TLA values at one moment, and different TLA values at another moment. In acoustics, the corresponding phenomena would be two tones with slightly different frequencies, giving rise to something called “beats”. The authors of this paper therefore calls the “light”-version of this phenomena beat flicker. The objective of the present work is to draw attention to a challenge that might arise, when assessing temporal modulated light, using tools currently available. The presence of beat flicker could be such a challenge to handle.

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KW - Modulation depth

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