Abstract
The article introduces the Interlaboratory Comparison (IC) test for three different types of light emitting diode (LED) lamps measurement about the key photometric, colorimetric, and electrical parameters. The article analyses the deviations of the test results between the reference values and test results from six participating laboratories. It found that the photometric and colorimetric parameters showed high deviations between the reference values and participating laboratories’ test results. The recommended participating laboratory improvement measures in the article are as follows: checking the traceability of standard artefacts, checking data correction, improving test procedures, checking ambient temperature, checking calculation software, and checking the response of the photodetector, etc.
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