Data from great tits in nest boxes around the transects with light posts, set up for the 'light on nature' project. Paternity was assessed for the juvenile birds in the broods, with the question on how the father related to these young birds, and whether this depends on the lighting conditions. For the analysis procedure used, and information on the data files, please refer to the file 'LON EPP for Dataverse.R' included in this dataverse (2019-04-09)