A Look At 5 CIE Lighting Publications In 2024

Here is a quick review of five CIE publications released in 2024:

CIE 253:2024 Overview of Methods for Evaluating Colour Rendition of White-Light Sources beyond Colour Fidelity

Technical Report CIE 253:2024 includes an overview of seven methods to characterize specific colour rendition characteristics of white-light sources beyond colour fidelity. Methods to characterize colour fidelity are described in CIE 13.3-1995 “Method of measuring and specifying Colour Rendering Properties of light sources” and CIE 224:2017 “CIE 2017 Colour Fidelity Index for accurate scientific use”.

The seven described methods are:

• Colour Quality Scale (CQS)
• Colour Rendering Index (CRI)-based Colour Rendition Properties (CRI-CRP)
• Colour Rendering Vectors and Colour Saturation Icon (CRV and CSI)
• Feeling of Contrast Index (FCI)
• IES TM-30 Method
• Memory Colour Rendition Index (MCRI)
• Preference Index of Japanese Skin Colour (PS)

More information is available here.

CIE 2024 Position Statement on Integrative Lighting – Recommending Proper Light at the Proper Time, 3rd Edition

 Knowledge about the effects of light on human health, behaviour, and well-being is advancing rapidly, as is interest in applying this knowledge in lighting technologies and practice.

Key take-away points from this Position Statement are:

• Good lighting quality balances human well-being, health, and functioning to achieve integrative lighting, while also respecting energy, environmental, and architectural considerations.
• Characterizing light for integrative effects should follow CIE S 026:2018, CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light.
• International experts meeting in Manchester, UK, proposed guidance for a healthy pattern of daily light exposure for healthy young adults that recommends a high light exposure during the day, a much lower level for 3 hours before bed, and near-darkness during sleep.
• Applying these recommendations in order to deliver high-quality integrative lighting will require careful design attention to prevent glare and manage lighting energy use, among other considerations.
• Enough is known today about lighting for health to provide general guidance to the public, which the CIE will provide together with other international partners in the coming months.

More information is available here.

CIE 252:2024 Assessment of Discomfort Glare from Daylight in Buildings

Glare models developed for electric lighting conditions are not applicable to daylight situations. This report summarizes the daylight glare prediction models which were confirmed by independent studies.

The cause of the sensation of discomfort glare appears to be a compound of two effects: contrast effect and total-amount effect. Total-amount glare is caused by the total amount of light reaching the eye, whereas contrast glare is caused by extreme luminance contrasts in the field of view.

More information is available here.

CIE 254:2024 A roadmap toward basing CIE colorimetry on cone fundamentals

This Technical Report presents a roadmap for the CIE, to help guide its development of a new, complete, self-consistent system of CIE colorimetric measures, based directly on cone fundamentals, with explicit consideration of the impacts of normal variations of the cone fundamentals due to age, field of view, and individual diversity.

The report proposes five new CIE Technical Committees be tentatively described with the following titles:

(i) Creation of LMS-based measures similar to some measures within the XYZ system;

(ii) Expansion of the cone fundamental wavelength range;

iii) LMS-based approximately uniform colour space;

(iv) Recommendations for a global study of cone fundamental diversity;

(v) Colorimetric effects of cone fundamental diversity.

More information is available here.

ISO/CIE 10916:2024 Energy Performance of Lighting in Buildings — Calculation of the Impact of Daylight Utilization

This International Standard is part of a set of standards which allows users to rate the overall energetic performance of buildings. Facades and rooflights have a key impact on the building’s energy balance. This document supports daylighting and lighting-energy-related analysis and optimization of facade and rooflight systems.

This International Standard defines the calculation methodology for determining the monthly and annual amount of usable daylight penetrating non-residential buildings through vertical facades and rooflights and the impact thereof on the energy demand for electric lighting. It is applicable for existing buildings and the design of new and renovated buildings. It also provides the overall lighting energy balance equation relating the installed power density of the electric lighting system with daylight supply and lighting controls (proof calculation method).

More information is available here.

David Shiller

David Shiller is the Publisher of LightNOW, and President of Lighting Solution Development, a North American consulting firm providing business development services to advanced lighting manufacturers. The ALA awarded David the Pillar of the Industry Award. David has co-chaired ALA’s Engineering Committee since 2010. David established MaxLite’s OEM component sales into a multi-million dollar division. He invented GU24 lamps while leading ENERGY STAR lighting programs for the US EPA. David has been published in leading lighting publications, including LD+A, enLIGHTenment Magazine, LEDs Magazine, and more.

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