Radiant intensity of light sources is measured with a spectral radiometer mounted with a precision measurement aperture. The spectrometer is calibrated in reference to a spectral irradiance standard. The radiant intensity is calculated from the measured irradiance and the solid angle resulting from the light source to aperture distance and the aperture Diameter. The integral radiant intensity is calculated from the measured spectral data for the specified wavelength range.
With the current lab standard lamps available, the spectral radiometer can be calibrated within the wavelength range from 300 to 2500 nm.
A factory calibration certificate is supplied listing the light source data, measurement set-up, traceability and calibration uncertainty.