Christmas lights can be energy intensive. Switching to LED Christmas lights from traditional Christmas lights will cost you nearly six times less to run. . If all 26 million UK homes swapped one string of standard fairy lights for LED lights, during the 12 days of Christmas alone, collectively they would save enough carbon dioxide to fill 188,000 double-decker buses (over 26,000 tonnes of CO2). Financially, it would save nearly £9.7m – that’s enough to pay the weekly energy bills for 400,000 homes. A simple money saving tip is to always remember to turn Christmas lights off when you go out or go to bed. If you’re forgetful, try using a timer switch so that they automatically turn off over night.