Study	Reason for exclusion
Hashim 2015	This RCT was excluded because trial authors studied use of a reflective surface behind the lights vs none, which we judged not to be our intervention
Martinez 1992	This RCT was excluded because the intervention method does not include use of reflective materials
Salehzadeh 2010	This RCT was excluded because the intervention was a reflective surface behind the lights compared with no reflective surface. We judged that this was not our intervention

RCT: randomised controlled trial.