The work described in this paper is a part of the process of lamp and photometer calibration
to obtain a new luminous-intensity scale with a lower uncertainty. The procedure and the
results of realizing the photometric scale with a standardized detector at the National
Institute for Standards (NIS) are described. This method enables photometric values to be
derived from absolute spectroradiometric measurements by exact computation. A filtered
trap detector has been characterized and used to measure the absolute spectral power ...