Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Beat flicker : a temporal light artefact due to multiple sources of time modulated light

Lindén, Johannes LU orcid ; Dam-Hansen, Carsten and Thorseth, Anders (2019) 29th Quadrennial Session of the CIE p.1179-1186
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
; and
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Flicker, Temporal Light Artefacts, Temporal Modulated Light, Stroboscopic effects, Stroboscopic Visibility Measure, Flicker Index, Modulation depth, Multiple sources, Beat Flicker
host publication
Proceedings of the 29th CIE SESSION Washington D.C., USA, June 14 – 22, 2019
pages
8 pages
publisher
CIE - International Commission on Illumination
conference name
29th Quadrennial Session of the CIE
conference location
Washington DC, United States
conference dates
2019-06-14 - 2019-06-22
DOI
10.25039/x46.2019.PO079
language
English
LU publication?
no
additional info
International Commission on Illumination Session, CIE 2019 ; Conference date: 18-06-2019 Through 22-06-2019
id
129e7b7a-030d-494c-8be7-74725f8103a9
alternative location
http://washington2019.cie.co.at/
date added to LUP
2023-06-16 17:23:29
date last changed
2023-06-28 14:07:30
@inproceedings{129e7b7a-030d-494c-8be7-74725f8103a9,
  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.}},
  author       = {{Lindén, Johannes and Dam-Hansen, Carsten and Thorseth, Anders}},
  booktitle    = {{Proceedings of the 29th CIE SESSION Washington D.C., USA, June 14 – 22, 2019}},
  keywords     = {{Flicker; Temporal Light Artefacts; Temporal Modulated Light; Stroboscopic effects; Stroboscopic Visibility Measure; Flicker Index; Modulation depth; Multiple sources; Beat Flicker}},
  language     = {{eng}},
  pages        = {{1179--1186}},
  publisher    = {{CIE - International Commission on Illumination}},
  title        = {{Beat flicker : a temporal light artefact due to multiple sources of time modulated light}},
  url          = {{http://dx.doi.org/10.25039/x46.2019.PO079}},
  doi          = {{10.25039/x46.2019.PO079}},
  year         = {{2019}},
}