A Leicestershire firm has taken these aerial photographs of Leicester during the day and then at night to see how much light is being used.
Bluesky International Ltd used a camera with state-of-the-art thermal imaging sensors to capture the city at night, known as nightmapping.
It is working with the University of Leicester, which will use the pictures to produce data to help combat light pollution, energy wastage and help to improve energy efficiency.
"Light pollution impacts all of us in many ways from a loss of view of the night sky to health problems caused by lack of sleep. "Intrusion of light into a bird or animals habitat can affect breeding or feeding patterns causing a threat to our urban wildlife, while inefficient or ineffective street lighting can impact crime patterns and costs money through wasted electricity. "If the street lights can be seen from as high up as the plan then they are obviously too bright and wasting energy.
Watch the full report by Rajiv Popat: