CIE News. March 2020

New CIE Publications

CIE 238:2020 Characterization of AC-Driven LEDs for SSL Applications

ISBN: 978-3-902842-64-0
DOI: 10.25039 / TR.238.2020
Division 2
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AC-driven LEDs (AC LEDs) operate on AC power and may be connected directly to a mains supply without the need of any electronics (e.g. LED drivers or control gears) for converting AC power to a constant direct current. Similar to DC-driven LEDs (DC LEDs), accurate measurements of AC LEDs are also difficult due to the high sensitivity of optical and electrical properties of LEDs to their thermal and operating conditions. In addition, forward voltage, current, and junction temperature of an AC LED change rapidly, which makes measurements even more difficult.
This Technical Report provides guidance for optical measurements of AC LEDs, performed at testing laboratories with emphasis on reproducibility and small measurement uncertainties by accurately setting and controlling the junction temperature. The report includes measurement methods, instrumentation, and procedures. The measurement methods and procedures used for optical measurement of AC LEDs are based on a specified junction temperature using either single AC cycle operation or continuous AC operation.
The publication is written in English, with a short summary in French and German. It consists of 25 pages with 15 figures and is readily available from the CIE Webshop or from the National Committees of the CIE.

CIE 239:2020 Goniospectroradiometry of Optical Radiation Sources

ISBN: 978-3-902842-79-4
DOI: 10.25039 / TR.239.2020
CIE 239:2020
Division 2

This technical report provides basic measurement principles and practical guidance in goniospectroradiometry of optical radiation sources (i.e. measurement of the spectral distribution as a function of the emission angle of the source). Specifically, it includes measurement principles of the angular distribution of spectral, radiometric, photometric and colorimetric quantities of optical radiation sources, the related scanning method and a practical guide to determine sampling interval, uncertainty aspects and calibration.
The publication is written in English, with a short summary in French and German. It consists of 22 pages with 10 figures and is readily available from the CIE Webshop or from the National Committees of the CIE.

New CIE Technical Commitees:

TC 4-62 Adaptive Road Lighting

To analyze needs, specify recommendations, develop methodology and promote application of adaptive road lighting based on various conditions and input data from field sensors and interconnected systems with respect and tailored to specific requirements of different user groups and user patterns.

Chair: Thomas Baenziger (CH)

TC 2-93 Revision of ISO 23539:2005(E) / CIE S 010/E:2004 Photometry - The CIE system of physical photometry

To revise ISO 23539:2005(E)/CIE S 010/E:2004 Photometry - The CIE system of physical photometry considering the comments raised at the systematic review of the document by D2/BA ballot and the ISO TC 274 consultation.

Chair: Anders Thorseth (DK)