The answer to your question depends on the size of the Christmas tree. For a small tree, such as one that stands less than 6 feet tall, you may need between 50 to 150 lights. For a medium-sized tree, such as one that stands between 6 and 8 feet tall, you may need between 200 to 300 lights. For a large tree, such as one that stands over 8 feet tall, you may need between 400 to 1000 lights. Remember, these are just estimates, and you may need more or fewer lights depending