Enough US states have swapped out their old street lights with LEDs that it may be ... production of melatonin which helps you sleep at night. And it’s not just humans whose circadian rhythms ...

Street lights on two main roads in East Yorkshire are to be switched off at night as part of an energy saving trial. Lamp-posts along the A164 from the Humber Bridge to Willerby and from Cottingham to ...

Paris is known as the "City of Lights" for its early and extensive use of street lighting and it being ... especially from high above Earth at night. This photo of Paris was taken at 9:54 p.m ...