Christmas lights do use a significant amount of energy, depending on how many lights you have and how long you leave them on. Using LED lights can help reduce your energy consumption as they use less power than traditional incandescent lights. To minimize your energy usage, consider turning off your lights when you are not at home, or using a timer to turn them on and off automatically. Additionally, be mindful of the number of lights you use and try to reduce the overall wattage. With a little planning and attention, you can enjoy your holiday lights without contributing to excessive energy consumption.