Light not only enables humans to see, but also affects cognition, mood, hormone balance and biological rhythms. Developments in lighting technology have now made it possible to control the spectral composition, intensity, and timing of light in different environments. However, a better understanding of how humans interact with and response to light is needed before guidelines for tailoring lighting environments can be developed. This research project will enhance our understanding of how we interact with and respond to light by will addressing critical questions about the interaction between visual and non-visual responses. It is hoped that this will help enable the optimal tailoring of lighting environments to optimise health and productivity through the effects of light on wellbeing and behaviour.