Are CALiPER tests verifiable and repeatable?
For a certain percentage of luminaires and replacement lamps in each round of testing, two or more samples are purchased and tested. This enables observation of variability across units of the same product. Furthermore, CALiPER “round-robin” tests are conducted regularly, with the same luminaire or lamp being tested by two or more testing laboratories and, in some cases, repeat testing is conducted by one laboratory. The overall average variation between units of the same product model, between testing techniques (i.e., integrating sphere compared to goniophotometer), and between test results from separate laboratories for CALiPER results to date is limited. Monitoring and analysis of variation and repeatability data is an on-going part of the CALiPER program. This information is shared with standards groups such as the IES SSL Subcommittee of the Testing Procedures Committee to support refinement of testing methods and to identify areas where clarification or additional standards may
