The Illuminating Engineering Society (IES) has published three new lighting standards:

ANSI/IES TM-40-24 IES Technical Memorandum: IES Method for Determining Correlated Color Temperature (CCT) and Distance from the Planckian Locus of Light Sources

Prior to the publication of this Technical Memorandum, no method for calculating CCT (nor Duv) has been formalized by a relevant lighting standards organization. This omission may have occurred because almost all the previously identified methods have suitable speed and accuracy for commercial applications (e.g., photometric testing), which usually only require a single calculation, so the speed does not matter, and small differences in CCT are perceptually irrelevant.

ANSI/IES TM-40-24 formalizes a recommended method for computing the CCT and Duv of a light source (or theoretical illuminant) given the input of its chromaticity coordinates, which are typically calculated from a spectral power distribution. It provides all necessary data and formulae to perform calculations and provides a summary of recent work that justifies the choice of this method. It also provides a brief explanation of the use and limitations of CCT and Duv.

ANSI/IES TM-32-24 Lighting Practice: Building Information Management

This Technical Memorandum recommends a standardization of parameters used in luminaire BIM content. The suggestions outlined in this document are intended to remedy synchronization issues between parameters, as well as ensure that lighting professionals are receiving the basic bits of information necessary to fulling their project’s needs, during the many different stages of development. A new online spreadsheet is available.

ANSI/IES LM-98-24 Lighting Measurement: In-Situ Temperature Test Method for Solid-State Lighting Products

Solid state lighting (SSL) products have a temperature dependence that affects performance. In the past decade, the industry has been measuring in-situ temperature characteristics of its assemblies or major components installed in integrated and non-integrated lamps and luminaires. This type of measurement is performed to obtain information on how these components behave in each individual lamp or luminaire and how that product’s operating temperature affects its lifetime performance, including lumen maintenance.

This document defines a method of measurement of the in-situ temperature of SSL components installed in integrated and non-integrated SSL lamps and luminaires. The method describes the procedures to be followed and the precautions to be observed in obtaining and reproducing in-situ temperature of SSL component measurements under standard operating conditions.

All three standards above will soon be added to the IES Lighting Library & Webstore.

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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