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In January 2010, the National Institute of Standards and Technology (NIST) began to offer a Measurement Assurance Program (MAP) for solid-state lighting (SSL) products to customers of the National Voluntary Laboratory Accreditation Program (NVLAP) under the support of the United States Department of Energy. The MAP program provided proficiency testing complimenting laboratory accreditation to ensure that as SSL products became more prevalent, capable testing laboratories would be available to handle the volume of measurement work. A conclusion of the analysis of the MAP data was that the type of AC power supply may have an influence on the electrical and optical measurement results. While the measurement of Active AC power appears to have a variance consistent with a normal distribution (assumption of randomness implied), the measurement of RMS AC current and power factor is somewhat bimodal. A few potential causes were identified and discussed.

NOT ALL 60 Hz AC ELECTRICITY IS THE SAME - COMPLICATIONS IN MEASURING SOLID-STATE LIGHTING PRODUCTS