Detailed Characterisation for Smart Dynamic Lighting

Smart light is gaining ground with increased speed driven by the pursuit of enhanced comfort, to achieve energy efficiency by dimming and to mimic the natural rhythm of daylight. Currently, lighting sources are only characterized and measured at full load as regulations [1] only set requirements for this and for standby power. Consequently, the customers don’t know the performance in dimmed and colour-tuned stages. Furthermore, problems of temporal light modulation typically increase with dimming. The questions are thus: How do the smart lighting sources perform when the light is dimmed and when the colour temperature is changed? Is there a need for more characterisation? The Danish ELFORSK project ISGES has measured detailed on many settings for different smart lighting sources used in respectively the domestic sector and the tertiary sector. Sep. 2022 was done a preliminary reporting from this project at LightSymposium 2022 [6] only including test of domestic lighting. This paper is comprehensive also including the tertiary sector and sector comparison. The analysis shows some smart lighting sources have substantial variation in luminous flux, energy efficiency and SVM and characterisation methods need to be included in the common standards as well as new data-sharing formats used by IES, ISO and CIE. This development is needed for reliable simulation of the smart dynamic lighting performance in a dynamic lighting setup.