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Application of New CIE Test Method

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In 2015, The Commission Internationale de l’Eclairage (CIE) published a new International Standard (CIE S 025/E:2015) called “Test Method for LED Lamps, LED Luminaires and LED Modules”. This standard was developed to be used by regulators and accreditation bodies around the world to harmonise the testing and accreditation of LED products. The SSL Annex conducted a study of this standard, including looking at the coverage of products, the performance metrics measured, the equipment covered and the requirements for testing.

This report prepared by the SSL Annex is titled “Application Study of CIE S 025/E:2015” and it evaluates the international standard for use as a standard by accreditation bodies, government policy makers and other key stakeholders as the basis for measuring quality and performance aspects of LED lighting products and equipment. 

CIE S 025/E:2015 specifies the requirements for measurement of electrical, photometric, and colorimetric quantities of LED lamps, LED modules and LED luminaires, for operation with AC or DC supply voltages, possibly with associated LED control gear.  LED light engines are assimilated to LED modules and handled accordingly.  Photometric and colorimetric quantities covered in this standard include total luminous flux, luminous efficacy, partial luminous flux, luminous intensity distribution, centre-beam intensity, luminance and luminance distribution, chromaticity coordinates, correlated colour temperature (CCT), colour rendering index (CRI) and angular colour uniformity. 

The lighting laboratory measurement instruments that are covered by CIE S 025/E:2015 include: sphere-photometer, sphere-spectroradiometer, goniophotometer, gonio-spectroradiometer and luminance meter.  The following lighting laboratory measurement instruments are also accepted for use with CIE S 025/E:2015 as long as equivalent results are demonstrated. In other words, these measurement instruments are acceptable if they are demonstrated to produce results equivalent to those of a conventional integrating sphere system or conventional (i.e., far-field) goniophotometer system: integrating hemisphere, near-field goniophotometer and imaging luminance measurement device (ILMD).

This report is a supporting document to the SSL Annex’s Interlaboratory Comparison 2017 (IC 2017) which was launched on 30 June 2017.  IC 2017 is using CIE S 025/E:2015 as the test method for testing the lamp and luminaires in this interlaboratory comparison.