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Laboratory Comparability

In 2014, the SSL Annex published a report (2013 IC Final Report) that compares the measurement accuracy of 110 laboratories worldwide testing Light Emitting Diode (LED) lamps and luminaires. That report is intended to help governments and manufacturers ensure that new LED products sold to consumers and companies are of high quality and meet the claimed performance. That work also sought to establish a common proficiency test method for accreditation programmes. Proficiency testing is used to establish whether a laboratory can be accredited for a specific test standard. Read more about that work in the News article from September 10, 2014.

The SSL Annex is now preparing to launch the 2017 Interlaboratory Comparison (IC 2017) for goniophotometer measurements. IC 2017 is open to all photometric labs that use goniophotometers for testing LED lighting products. The formal announcement and the Protocol for IC 2017 describing detailed test specifications will be posted in June 2017 and registration will be open for a few months. Participant measurement rounds will start in July and continue until early 2018.  (click here for a PDF copy  of the pre-announcement letter about IC 2017) 

Lighting laboratories that use or plan to use their goniophotometer systems for testing of LED lamps and luminaires are encouraged to participate in this global interlaboratory comparison. IC 2017 is being organised primarily to compare goniophotometric measurements of LED luminaires (including street lighting luminaires) and narrow-beam LED lamps, which were not covered in the SSL Annex’s previous interlaboratory comparison in 2013 (IC 2013)[1]. This new interlaboratory comparison will study the equivalence of different types of goniophotometers, e.g., near-field goniophotometers and far-field goniophotometers, and investigate the measurement variations and the capability of participating laboratories using goniophotometers to measure SSL products.

IC 2017 is not only a technical study, it is designed in compliance with ISO/IEC 17043 to serve as a proficiency test for SSL testing accreditation programmes that recognise this comparison, as was done in IC 2013. IC 2017 will use CIE S 025/E:2015[2] as the test method for measurement, and if recognised by accreditation bodies, the participant results reports may be used as a proficiency test not only for CIE S 025 but also as regional test methods such as EN 13032-4 (Europe, equivalent to CIE S 025); LM-79 (USA); KS C 7653 and KS C 7651 (Korea) and possibly also for the test methods in China and Japan, for LED lighting products. Near-field goniophotometers and non-standard goniophotometers that rotate the operating position of the luminaire with a correction technique (allowed in CIE S 025) will also be covered in this interlaboratory comparison, and their results may be used for the validation requirement for such goniophotometers in CIE S 025 or to assist in an accreditation application. The results can also be used for benchmarking.


[1] The Final Report of IC 2013 is available at

[2] For information on CIE S 025/E:2015, visit: