Lighting should be provided for WASH facilities in Humanitarian contexts according to several standards. Evidence for this and the practical budget, operational and management responsibilities are less clear. A three-country research project looking at the impact of lighting on WASH use and Gender-Based Violence (GBV) required a multi-disciplinary approach, combining OXFAM's practical implementing expertise with WEDC's research-oriented approach. The research showed how much more is needed for safe sanitation than just building latrines. Lack of usage of latrines had implications for environmental health. A reason for not using latrines was due to fear of many things, including GBV. The location of the facility was a common concern, but simple lessons are not easy to distil as the context varies between settlements and changes rapidly overtime. The provision of lighting was welcomed by a wide range of stakeholders, but other factors still affect both GBV and WASH outcomes.