# New Approaches in Dynamic Metrics for Lighting Control Systems: A Critical Review
## 6 Conclusions  
This study aimed to critically evaluate a selection of static and dynamic daylighting metrics to understand their individual roles, limitations, and interrelations in assessing daylight performance in architectural spaces. Through comparative simulations of a standardized room in Seville and London under varying orientations, window-to-wall ratios, and occupancy schedules, the analysis sought to determine the sensitivity, consistency, and relevance of each metric for visual comfort, energy performance, and circadian health.  
There is no consistent correlation between the different daylighting metrics when considering different locations, orientations, occupancy hours, or illuminance thresholds. While the goal of achieving one or two indices capable of reliably determining the quality of daylight within a space is desirable, the current reality is that a combination of distinct metrics is needed to achieve a comprehensive and robust evaluation. A more promising direction could involve the development of intuitive tools that simplify both the calculation and graphical interpretation of results. This approach could empower non-specialized designers to draw meaningful conclusions efficiently, sacrificing accuracy or requiring excessive time. Consequently, a clear understanding of the specific strengths and applications of each metric remains essential for a complete daylighting assessment:  
* DA remains a valuable and easily interpretable metric for assessing daylight performance, effectively indicating whether a space receives sufficient natural light for specific visual tasks.
* While UDI's upper threshold is not reliable for accurate glare assessment, it is useful for identifying specific areas within a space where excessive solar incidence may lead to increased cooling loads.
* Identical sDA and ASE values can represent significantly different lighting conditions, especially when comparing spaces across different locations and orientations. Therefore, these metrics should be used in conjunction with others--such as UDI or DA--to gain a more accurate understanding of real luminous performance.
* CSA is a promising tool for estimating the percentage of days on which occupants experience adequate melatonin suppression to support circadian entrainment. However, the underlying biological models are still evolving, meaning future adjustments to the CSA methodology are anticipated.
* DAo.con is a particularly useful metric for the design of sensorless lighting control systems. Nevertheless, its algorithm requires further refinement for spaces with north-facing orientations, particularly in climates dominated by clear-sky conditions.  
Conceptualization, G.G.-M., M.A.C., I.A. and P.B.; methodology, G.G.-M., M.A.C., I.A. and P.B.; software, G.G.-M., M.A.C., I.A. and P.B.; validation, G.G.-M., M.A.C., I.A. and P.B.; formal analysis, G.G.-M., M.A.C., I.A. and P.B.; investigation, G.G.-M., M.A.C., I.A. and P.B.; resources, M.A.C. and I.A.; data curation, G.G.-M., M.A.C., I.A. and P.B.; writing--original draft preparation, G.G.-M., M.A.C., I.A. and P.B.; writing--review and editing, G.G.-M., M.A.C., I.A. and P.B.; visualization, G.G.-M., M.A.C., I.A. and P.B.; project administration, M.A.C. and I.A.; funding acquisition, M.A.C. and I.A. All authors have read and agreed to the published version of the manuscript.
Data Availability Statement: All the data used in this work can be found in this document, as well as in the references [63; 86].  
The authors wish to thank the University of Seville for supporting this research through its PIF predoctoral contract program, within the framework of the Plan Propio de Investigacion y Transferencia. The authors are also grateful to all those who contributed to the publication of this article, especially to [PERSON] for his unwavering moral support.  
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.