Experimental Study on Deviations in Illuminance Measurement from LED, Gas-Discharge, Incandescent and Tungsten-Halogen Light Sources

Illuminance is a fundamental quantitative parameter of the light environment and the technical devices for its measurement are widely recognised. A number of studies, however, within the field, have highlighted significant challenges in taking accurate measurements of illuminance in the conditions of a light environments created by different light sources, a problem which has been further exacerbated by the widespread implementation of LED light sources with varying parameters. The present study, therefore, focuses on evaluating the significance of the problem when using light sources and luxmeters of different technical classes. The quantitative estimates obtained from this research will enable the development of applied methodologies to correct measurement errors, and, thus, enhance the accuracy of illuminance measurements, once the systematic and inherent nature of these errors are precisely determined.