The increasing use of white light-emitting diodes (LEDs) for general illumination applications has the potential of enormous societal benefits by reducing costs due to energy savings, but also on improving overall lighting quality and performance. However, the significant differences in the optical characteristics of LEDs from traditional incandescent light sources, has also introduced significant metrological challenges. This paper will describe the activities that are being carried out within the Consultative Committee for Photometry and Radiometry (CCPR) to address these LED metrology issues. This includes information on the CCPR strategic plan for this emerging area, the establishment of LED comparison artifacts and measurement comparisons at the level of the CCPR national measurement institutes (NMIs) and regional metrology organizations (RMOs) to support confidence in associated LED calibration and measurement capabilities, as well as the recent creation of CCPR Task Groups focused on pilot studies and technical discussion of the use of white LED sources as transfer standards. Detailed information is provided for several NMIs that are developing LED-based calibration standards for photometry.
