INTERPOLATION METHODS OF I-TABLES OF ROAD LIGHTING LUMINAIRES

Abstract

For the calculation of the photometric parameters of the road lighting it needs to have photometric data of the luminaires used for illumination of carriage ways or walkways. These data are in the form of an intensity table that provides a luminance intensity distribution emitted by the luminaire in all relevant directions. A goniophotometer is required to measure the luminous intensity distribution of luminaires. Results from goniophotometric measurements are very important for lighting engineers who are using these results in lighting calculation. Due to measurement of luminous intensity in discrete values of angle interval, interpolation methods of I-tables will be needed to enable values to be estimated for calculation of performance of road lighting system. At present is according to standard or recommendation treating with road lighting calculation recommended linear interpolation.