2020 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795157/ Baloch, R.M Europe Observational Epidemiology Study Students Elementary (K-5) Lighting Test Performance Illuminance Natural light Indoor air quality School Performance A positive relationship was found between performance scores and type of window shading, latitude, percentage of window facing south, and window glazing, with the highest impact due to the window-to-floor area ratio. Data collected in the SINPHONIE study across 12 European countries indicate that daylighting parameters are relevant to schoolchildren’s performance.