Cities have long equated brightness with safety. From sodium vapour lamps to high-efficiency LEDs, the evolution of urban ...

Many of these luxe lamps had much humbler beginnings. They can trace their core principles to a street light Henningsen invented for a 1919 competition held by Copenhagen Energy, the city’s public ...

How dark is the night sky where you live? If you’re in an urban area, the answer will likely be “not dark at all”. The pervasiveness of artificial light – be it in the form of streetlamps, billboards, ...