The best way to recycle Christmas tree lights is to take them to a local recycling center. These centers are equipped with the necessary equipment to properly recycle electronic items such as Christmas tree lights, and they will ensure that the materials are recycled in an environmentally-friendly manner. Some centers may also accept Christmas tree lights as part of their e-waste collection program. You can check with your local government or waste management department to find out where to take your Christmas tree lights for recycling.