Absolute spectroradiometric and photometric scales based on an electrically calibrated pyroelectric radiometer

An absolute spectroradiometric scale has been developed based on an electrically calibrated absolute detector and silicon detector-interference filter combination. Using the recently adopted definition of the photometric base unit, the candela, the absolute spectroradiometric scale was used to realize a photometric scale, i.e., to calibrate incandescent lamps as luminous intensity standards. These new scales were compared with existing standards and were found to agree to better than 1%.