Modern society depends on light in many forms; from high-intensity natural daylight and artificial lighting, to the glow of TV screens, computers, tablets, smartphones, and games. Light is so ubiquitous – and generally travels unseen (except, for instance, in fog) – that we often take it for granted. Critically, we probably have more light than we need, while people are generally unaware of the amount of light they are exposed to, and of its economic and environmental costs.
Words: Professor Brian Espey, School of Physics, Trinity College Dublin. Image: JesseJames.