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Electricity. In 1882, the first Christmas tree was lit by the use of electricity. Edward Johnson lighted up a Christmas tree in New York City with eighty small electric light bulb. It should be noted that Edward Johnson created the first string of electric Christmas lights that were then mass produced around 1890.
By the time Edison had started his lighting project in 1877, some twenty inventors had already built light bulbs with either platinum or iridium filaments heated in air, or carbon filaments heated in a vacuum. Platinum was the ideal material.