This CIE Tutorial has been developed to support the understanding and proper application of CIE S 026. It is expected that an outcome for participants at this tutorial will be clarity on how light can be quantified and assessed for its ability to achieve important biological effects relevant for human health, performance and well-being, without depending on visual images  – in this way the sub-title for this tutorial is “Methods and principles to define light for responses beyond vision”.


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Programme on March 14th:

time topic presenter
08:45-10:00 Tour of Signify Lighting Application Center
(registration needed, tour starts 09:00)
Annette Steinbusch
10:00-11:00 Registration & Coffee (with light quality demos by Signify) Geertje Hazenberg
11:00-11:30 Welcome – Background to CIE S026: Light and Lighting Aspects Luc Schlangen
11:30-12:15 Phototransduction and Neurophysiology of Light Effects
– Photoreceptor signalling, spatial distribution and melanopsin bistability
– Temporal and spatial light contrasts
– Dose-response curves
Rob Lucas
12:15-13:00 Fundamentals in Human Photoreception
– Basic concepts: scotopic, mesopic and photopic vision, colour vision
– Rod & cone fundamentals, operating ranges, univariance, colour matching
– Sensitivity-affecting factors including pre-retinal filtering in humans
Manuel Spitschan
13:00-14:00 Lunch break (lunch is provided)
14:00-14:45 Effects of Light on Humans (session 1)
– Circadian timing system
– Implications for physiology & metabolism
– Implications for health
Ken Wright
14:45-15:30 Effects of Light on Humans (session 2)
– Human sleep  and performance/alertness/mood
– Effects of daytime/nighttime light exposure
– Winterdepression (SAD), chronotherapy and mood disorders
Marijke Gordijn
15:30-16:00 Coffee break  – group picture
16:00-16.30 International Standardization of Light and Lighting
– What is a standard?
– Different organizations, CIE, ISO, IEC, CEN, IES…
– Legal requirements
John O Hagan
16:30-17:30 Introduction of  CIE S026 (session 1)
– a-opic action spectra and a-opic (ir)radiance
– a-opic equivalent daylight (il)luminance
– Field of vision aspects
Luc Schlangen
17:45 Departure bus shuttle to city centre/dinner location
19:00-21:30 Joint dinner (city centre, registration needed)

Programme on March 15th:

Friday March 15th 2019                                                    Chairs: LS/PB
time topic presenter
09:30-10.00 Applications and Implications of CIE S026
– What is CIE recommended practice?
– New/old a-opic quantities, illuminant examples, CCT
Luc Schlangen / Luke Price
10:00-10:30 From Photoreceptor Inputs to Responses and Models
– α-opic silent substitution and the human pupillary response
– Photoreceptor combinations, principles and evaluation of circadian response models
Manuel Spitschan
10.30-11:00 Coffee break
11:00-11:20 Evaluating the  a-opic Radiant Flux of Light Therapy Devices Mariëlle Aarts
11:20-12.00 Measurement Methods, Set-ups and Devices
– Measuring (ir)radiance/(il)luminance, field of view averaging
– CIE S026 implications for (il)luminance meters
– CIE S026 implications for wearable light sensors
Peter Blattner / Luke Price
12:00-12:30 Light and optical safety
– Photobiological safety: blue light hazard and temporal light modulation aspects
– Harm versus benefit
John O Hagan
12.30-13.30 Lunch break (lunch is provided)
13:30-13:50 Impact of Light on Species and Ecosystems Kamiel Spoelstra
13:50-14:10 Lighting for Healthcare, Elderly-care and Outdoor Setttings
– Considerations, best practices, CIE S026 implications
Ken Wright
14:10-14:30 Lighting for Workplaces, Homes and Light Therapy
– Considerations, best practices, CIE S026 implications
Marijke Gordijn
14:30-14:50 Light: a Driver for Indoor Wellbeing  – Strategic Roadmap of the Lighting Industry Jan Denneman
14:50-15:15 Coffee break
15.15-15:30 CIE Activities/Outlook Peter Blattner
15.30-16:00 General Discussion, Wrap-up and Closure Luc Schlangen