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The Lighting Environment, Its Metrology, and Non-visual Responses.

Luc J M Schlangen1, Luke L A Price2

  • 1Department Human-Technology Interaction, Intelligent Lighting Institute, Eindhoven University of Technology, Eindhoven, Netherlands.

Frontiers in Neurology
|March 22, 2021
PubMed
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The CIE S 026 standard offers a new way to measure light

Area of Science:

  • Chronobiology and Photobiology
  • Human Health and Lighting

Background:

  • International standard CIE S 026:2018 provides a method to characterize light exposures for non-visual photoreception.
  • This standard defines five spectral sensitivity functions for five α-opic retinal photoreceptor classes influencing human non-visual responses via intrinsically-photosensitive retinal ganglion cells (ipRGCs).
  • The CIE also released an open-access α-opic toolbox for calculating these quantities.

Purpose of the Study:

  • To apply the new CIE S 026 α-opic metrology to everyday light sources.
  • To explore how variations in melanopic content of light can support human health and well-being.

Main Methods:

  • Utilized the CIE S 026 standard and its associated α-opic toolbox.
  • Applied the metrology to analyze a natural daylight time series, various LED lighting products, and a smartphone display screen.
Keywords:
circadian rhtymsintrinsically-photosensitive retinal ganglion cellslight therapymelanopsinmelatoninnon-image forming effects of lightsleepvisual perception

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Main Results:

  • Demonstrated the application of α-opic metrology to diverse light sources.
  • Provided examples suggesting strategies for using light variations to support human health.

Conclusions:

  • The CIE S 026 metrology enables traceable measurements and quantitative specification of light exposures.
  • Variations in melanopic content of light can be leveraged in strategies to promote human health and well-being.