POPSUGAR Home Holiday Guess What Type of Lights Are on the National Christmas Tree? by Home 12/15/09 0 Shares Like us on Facebook Sign up for our daily newsletter > This year, the National Christmas Tree is lit from tip to bottom with a type of energy-saving light. Can you guess what these lights are? Image Source: Getty Read More Energy EfficiencyEco Living TipsChristmas TreeHolidayGuess Who Holiday 100+ of the Best DIY Gifts Ever 10 Slow-Cooker Desserts That Anyone Can "Bake" TV Dinners: Make the Infamous Beef Wellington From Hell's Kitchen The Perfect Personalized Gift: DIY Tile Photo Coasters POPSUGAR, the #1 independent media and technology company for women. Where more than 75 million women go for original, inspirational content that feeds their passions and interests. Get Inspired With Our Living Newsletter Personalize Tech Food Vegetarian Home Love and Sex DIY Sign up with facebook or By signing up, I agree to the Terms and to receive emails from POPSUGAR.