Practices

Inter-laboratory Comparison of Light Emitting Diode (LED) Lamps

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This Inter-laboratory Comparison testing project is one of a series of efficient lighting compliance activities under the United Nations Environment Programme (UNEP)-Global Environment Facility (GEF) en.lighten initiative project “Securing climate change benefits of efficient lighting in Southeast Asia and Pacific economies via MVE capacity building activities”, which is funded by the Australian Government. It was designed in compliance with ISO/IEC 17043, Conformity assessment - General requirements for proficiency testing.

The purpose of this project is to identify the differences among the participating laboratories and analyze the potential technical issues that exist in these laboratories. Three different types of light emitting diode (LED) lamps were selected to be tested against the key photometric, colorimetric, and electrical parameters. The Global Efficient Lighting Centre (GELC), as the reference laboratory, organized this inter-laboratory comparison test with six laboratories from four countries in Southeast Asia (Indonesia, Philippines, Thailand and Vietnam).

The photometric, colorimetric, and electrical parameters were tested by GELC and the six participating laboratories. This report analyzes the deviations of the test results between the reference values from GELC and test results from each participating laboratory. It found that all the electrical test results from the six participating laboratories are generally considered to be satisfactory; while the photometric and colorimetric parameters showed high deviations between the reference values and participating laboratories’ test results. The improvements for the participating laboratories recommended in this report are to check their traceability of standard artifacts, check data correction (e.g. sphere special non-uniformity correction, self-absorption corrections, near-field absorption), improve test procedures, check ambient temperature, check calculation software, and to check the response of the photodetector.