carbon footprint by over 30% LED bulbs The US Department of Energy http://energy.gov/eere/ssl/led-basics LED technology http://energy.gov/eere/ssl/led-basics LED Bulbs white light 80 to 90 percent. The LED lamp lasts for 20000 hours of use Learn how thermal management impacts LED system design LED bulbs United States Department of Energy Energy.gov white light LEDs highly efficient LED technology is very efficient Learn more about color quality of white LEDs 80 to 90 percent. Energy.gov: LED Basics 50,000 hours LED Office of Energy Efficiency and Renewable Energy U.S. Department of Energy