Lighting and display screens: Models for predicting luminance limits and disturbance

An investigation of the level of disturbance caused by reflections from a variety of display screens, including interactive whiteboards, has been carried out using three test methods: Luminance adjustment, category rating and reading. The results from the luminance adjustment test and the category rating test were consistent, both showing similar significant effects of lighting-display parameters on the disturbance caused by screen reflections. In contrast, the objective measure of task performance in the reading test was barely responsive to reflections on the screens. Two models have been developed, one to predict the luminaire luminance at which 95% of observers were not disturbed by the reflections and the other to predict the rating of disturbance caused by reflections from the screens. Both models are based on lighting-display parameters including the size and luminance of the reflected light source and the specular reflectance, the effect of haze reflection and the background luminance of the display screen. These models can be used generally, to guide lighting recommendations and, specifically, to identify suitable luminaires to be used with given set of display screens or suitable display screens to be used with a given lighting installation

New lighting recommendations for the classroom of the future based on luminous parameters of display screen equipment

Investigations in classrooms reveal that disturbing reflections on display screens are the primary complaint regarding the visual environment: in the classroom of the future such screens and hence complaints are expected to increase in quantity. An experiment was carried out to investigate the relationship between lighting, visual acceptability and luminous properties of display screens. This article presents preliminary results from tests using the adjustment method. The results suggest that the limits of luminaire luminance prescribed in current guidance, BS EN 12464-1:2002 and SLL Lighting Guide 7, are too low - modem display screens can tolerate higher luminances