Data analysis
RS, MP, thematic-analysis
For qualitative data, following an inductive, thematic-analysis approach, all transcripts were reviewed to develop a coding scheme relevant to the trial outcomes, and to capture experiences of trial participants. Codes were independently developed by two authors (MP, RS) in vivo, through repeated engagement with the data set. Coding schema were compared, with discrepancies in codes resolved through discussion until a consensus was reached. Using a framework approach, coded data was organized by topic, and entered into an analytical matrix. Authors MP and RS reviewed the matrix to identify concepts which could organize the multi-level impacts of lighting and illumination on psycho-social health. We noted congruence between the social integration theoretical model (described below) and our conceptual findings, and therefore used this framework to guide organization of our study results.For quantitative data, summary statistics are presented as median (interquartile range) for continuous variable, and categorical data are presented as number (%). Hours of daily lighting use was normally distributed. A linear mixed effects model as implemented by the nlme R package was used to compare sensor-based measurements of daily lighting use (in hours) before and after receipt of the intervention solar lighting system [