Lighting system behaviour verification of interior illumination regulated to constant level of illuminance

This article represents a continuation of a longstanding research concerning behaviour prediction (consumption) of lighting systems collected on the constant level of illuminance depending on daylight. Due to the occurrences of differences between the prediction model and the actual long-standing lighting measurement in monitored lighting system it has been vitally important to seek the source of such differences. It has been discovered that actual savings amount is higher than predicted savings amount. Such result has been reached due to the fact, that regulated lighting systems are being collected during daylight and artificial lighting cooperation in higher rates than desired. It has been resulting in collecting to a lighting level which has not complied with normative demands for requested visual tasks. This situation is unacceptable on the basis of the hygienic conditions. This is caused in the view of the fact that in some situations the immediate lighting level has not even reached the hygienic minimum demands for permanent residence.