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Main Title: Effective radiant flux for non-image forming effects – is the illuminance and the melanopic irradiance at the eye really the right measure?
Author(s): Broszio, Kai
Knoop, Martine
Niedling, Mathias
Völker, Stephan
Type: Conference Object
Language Code: en
Abstract: Research indicates that intrinsically photosensitive retinal Ganglion Cells are not evenly distributed or evenly sensitive throughout the retina. Still, most research looking into non-image forming (NIF) effects uses an integral measured quantity, illuminance or melanopic weighted irradiance, to represent the amount of light at the participants’ eye level. This paper describes a theoretical approach to define the effective radiant flux for stimulating the ipRGCs, taking into account a spatially resolved sensitivity. Research on retinal sensitivity is scares and not yet substantial, but the methodology can easily be adopted when areas of specific sensitivity are set. Preliminary results indicate that, with similar vertical illuminances and spectral power distribution, typical office lighting solutions might have a lower NIF effectiveness than settings with higher luminances in the central part of the field of view. This could explain why research on NIF effects is inconclusive, even though reported lighting conditions are similar.
Issue Date: 18-Sep-2017
Date Available: 3-Jul-2018
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): non-image-forming effects
non-visual effects
light incidence
Human Centric Lighting
spatially resolved measurements
office lighting
retinal sensitivity
inferior light exposure
nasal light exposure
NIF effects
Proceedings Title: Lighting for modern society : proceedings of the Lux Europa 2017
Editor: Kobav, Matej B.
Publisher: Lighting Engineering Society of Slovenia
Publisher Place: Ljubljana
Page Start: 31
Page End: 36
ISBN: 978-961-93733-4-7
Appears in Collections:FG Lichttechnik » Publications

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