Estimation of the uncertainty in measurement of light distribution of luminaires by means of telecentric photometer

The paper shows the methodology for estimation of the calibration uncertainty of a telecentric photometer. It shows in details all the possible sources of uncertainty that should be considered in a photometrical measurement, according to the construction of the equipment. In order to verify the experimental results, a verification has also been carried out – the light distribution of the test luminaire has also been measured with a previously calibrated mirror distributive gonio photometer