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 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? Source: Getty Read More Energy EfficiencyEco Living TipsChristmas TreeHolidayGuess Who Holiday Burgers and Pasta Salad Have You Overstuffed? Yoga to Ease Digestion 40+ Life-Changing Books to Read This Year 16 Unexpected, High-Tech Gifts For Him 100 Gifts Your Best Friend Will Obsess Over Get inspired with our daily newsletter Tech Love and Sex DIY Food Vegetarian Home Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR.