## 4 Analysis of Results and Discussion
### Divergence of DA and DAp According to Room Location
In the case of the comparison of the metrics according to the reflectance of the inner surfaces, DAp does not provide a noticeable deviation in comparison with DA (mean deviations of 5.1% for 300 lx and 8.1% for 500 lx). Thus, it is not a decisive parameter to determine the difference between both metrics. Finally, the application of DAp shows more accurate results for those locations with mainly overcast skies such as London (mean deviations of 9.4% for 300 lx and 5.6% for 500 lx) than for those with mainly clear skies (3.8% and 2.9% respectively). Given these conclusions, it can be stated that, in the case of educational buildings, the poorer the access to natural light (small windows, window facing North, or locations with mainly overcast skies), the higher the divergence produced between DAp and DA, reaching divergences in the results close to 10%. Thus, the use of this new metric allows for a more precise and adjusted characterization of the entry of daylight in seasonal use spaces, and therefore a more accurate estimate of the impact on energy consumption if an electric lighting control system is implemented through lux meters. Conceptualization, A.R., M.A.C., I.A. and O.L. ; methodology, A.R., M.A.C., I.A. and O.L. ; software, A.R., M.A.C., I.A. and O.L. ; validation, A.R., M.A.C., I.A. and O.L. ; formal analysis, A.R., M.A.C., I.A. and O.L. ; investigation, A.R., M.A.C., I.A. and O.L. ; resources, A.R., M.A.C., I.A. and O.L. ; data curation, A.R., M.A.C., I.A. and O.L. ; writing--original draft preparation, A.R., M.A.C., I.A. and O.L. ; writing--review and editing, A.R., M.A.C., I.A. and O.L. ; visualization, A.R., M.A.C., I.A. and O.L. ; supervision, A.R., M.A.C., I.A. and O.L. ; project administration, A.R., M.A.C., I.A. and O.L. ; funding acquisition, A.R., M.A.C., I.A. and O.L. All authors have read and agreed to the published version of the manuscript. The results presented were funded by the Ministry of Science and Innovation of the Government of Spain through the research projects DYNALIGHT: Efficient design for biodynamic lighting to promote the circadian rhythm in shift work centers (Ref BIA2017-86997-R) and CHRONOLIGHT: Biodynamic wide spectrum lighting for biological chronoregulation and pathogens neutralization in hospital facilities (Ref PID2020-117563 RB-I00). The authors wish to express their thanks for all the technical and financial support provided, including the research project: CARELight_Lite: Biodynamic lighting for circadian rhythm regulation of healthcare personnel in Pediatric Intensive Care Units (Ref PI-0136-2019). The authors are grateful to all those who collaborated in this research project, especially to [PERSON] for encouraging this article. The authors also wish to thank the Junta de Andalucia and the University of Seville for providing the test cell facilities which made it possible to validate the metrics used in this research. The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.