The Pacific Northwest National Laboratory is moving past energy efficiency research and into researching better life indoors. One of their projects was looking into ‘realistic’ lighting in an Neonatal ICU. Andrea Wilkerson, senior lighting researcher, shared her findings for sun-like colour and brightness automation. Beyond what happened during the test we explore some of the broader implications of circadian entrainment and it’s ability to signal behaviour and mood in subtle ways.We also settle the question of whether or not we can meaningfully or honestly label something as ‘Circadian-Friendly’ and continue to probe into why we see so many women in lighting research.