Christmas lights became popular in America in the 1880s. At that time, the candles were used to decorate the Christmas trees. To keep the fire safe, people put a lightweight metal sheet around the light. Later, the artificial Christmas tree appeared. Instead of using candles, they began to use electricity to decorate Christmas trees. In the 1920s, stores and shop owners began to light strings of artificial Christmas lights outside their buildings. People loved driving around town to see all the colorful Christmas lights. Cities began to decorate their downtown business district with lights and larger displays. Companies such as General Electric and Westinghouse even made commercial light sets to meet the increasing demand. Christmas lights continued to evolve with the advancement of LED technology. LED lights are much longer lasting and brighter than traditional incandescent bulbs, and they also consume much less energy than incandescent bulbs. Today, LED Christmas lights are popular in many areas, both indoors and outdoors. LED Christmas lights are becoming increasingly popular due to their low energy consumption, long life, and bright, colorful lights. Christmas lights have become a popular part of Christmas decorations around the world. From a group of a few people decorating their Christmas trees with traditional candles, to entire cities and towns being decorated with modern LED lights, Christmas lights have become a symbol of holiday cheer.