Modelling the Behavior of Lighting Systems Controlled at a Constant Level of Illuminance

The paper deals with the issue of the dimming of lighting systems of the artificial lighting controlled to a constant level of illuminance based on contributions of daylight. It solves the issue of differences, which arise when setting the existing lighting systems without daylight and their subsequent operation in dimming to a constant illuminance level with the presence of daylight. This issue is addressed in the paper by means of modelling the illuminance systems of the artificial lighting and CIE overcast sky producing different illuminance of an outdoor, unscreened surface. The modelling took place based on the contributions of the equally cloudy sky to the interior. The article analyses the influence of the location and reception characteristics of the light sensor on the course of illuminance and the uniformity by solving the interior spaces at various levels of outdoor lighting. Primarily, the simplest types of lighting systems dimmed as a whole based on the input of one illuminance sensor were modelled there.