Lighting is a hallmark of our civilization. With artificial light we have turned night into day; extending working, shopping and entertainment hours, improving safety and security, and allowing us to transform the dark side of the planet into a twinkling map of human activity. As is often the case, our technological development rapidly outpaces our evolutionary capacity, leaving our biology playing catch-up to the demands of modern life. Seemingly unwilling to ever take a step “backwards,” it is up to technology to overcome the issues it creates. Just as renewable energy technology fights back against the environmental issues caused by industrialization; modern lighting technology is facing up to the problems associated with abundant artificial light – namely human health and wellbeing. Research has shown that blue wavelengths, plentiful in white daylight, can excite a pigment called melanopsin that resides in the eye’s non-visual photoreceptors – technically referred to as intrinsically photosensitive retinal ganglion cells (ipRGCs). […]