Illuminance evaluation in automatically dimmed interior lighting systems

To verify a quality of dimmed lighting systems with illuminance regulation to constant level it was necessary to develop an automatic measuring system. This system works as a long-term measurement of illuminance of interior workplace (10 illuminance at the same time) together with the daylight measurement. This system measures horizontal illuminance at the workplace as it is required by norms. However, the sensors used in dimmed interior lighting systems are generally placed on the ceiling and that is why the automatic system could not work well and final measured illuminance at the workplace could be different from the set request (norm) if there is a dynamic daylight in the room.