Evaluation of different general V(λ) mismatch indices of photometers for LED-based light sources in general lighting applications

• Published in: Metrologia Vol. 59; no. 6; pp. 65003 - 65014
• Main Authors: Krüger, Udo, Ferrero, Alejandro, Mantela, Ville, Thorseth, Anders, Trampert, Klaus, Pellegrino, Olivier, Sperling, Armin
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.12.2022
• Subjects: bootstrap; Calibration; Fluorescent lamps; Light sources; Lighting; Luminous efficacy; measurement uncertainty; Monte Carlo; photometer; Photometers; spectral matching; Statistical analysis
• ISSN: 0026-1394; 1681-7575
• DOI: 10.1088/1681-7575/ac8f4d

Abstract The general V ( λ ) mismatch index, f 1 ′ , of a photometer quantifies the deviation between its determined relative spectral responsivity, s rel λ , and its nominal responsivity, the spectral luminous efficiency function for photopic vision, V ( λ ). LED-based light sources now dominate in general lighting, displacing incandescent and fluorescent lamps. Furthermore, the calibration of photometers will very likely see the replacement of the reference CIE standard illuminant A with CIE reference spectrum L41. The article evaluates the consequences. Should we also change the definition of the general V ( λ ) mismatch index? Based on performance criteria, the individual indices are evaluated using various datasets with the help of statistical analyses. As a result, the authors can conclude that the current definition works very well even under changed calibration and application conditions and does not need to be changed. Other evaluated indices for a new index definition perform only slightly better in some cases, but do not generate generally better properties.