At National Metrology Institute of Turkey (UME, Ulusal Metroloji
Enstitüsü), luminous intensity unit of candela was realized using
detector-based approach and photometric scale was re-established depending
on this new realization. Candela was measured on photometric bench using
interferometric distance measurement system and filter-radiometer traceable
to UME primary level electrical-substitution cryogenic radiometer. Thermally
stabilized filter radiometer, which has been designed for spectral
irradiance measurements, is consists of trap detector, filter housing and
precision aperture. Different measurement techniques were used to fully
characterize each parameter of filter-radiometer; like effective aperture
area, spectral transmittance of $V(\lambda)$ filter and responsivity of
trap detector.