• Year Humphry Davy demonstrated the arc lamp, a light bulb precursor: 1806
  • Number of materials Edison tested to find the right filament to electrically produce light in his bulb: 1,600
  • Year that all bulbs — incandescent, CFL, and LED — on the market will be required to use 25% less energy: 2014
  • Number of watts a CFL bulb needs to produce the same light as a 60w incandescent: 13
  • Amount of mercury waste produced by fluorescent bulbs in landfills: nearly 30,000 pounds
  • Number of sealed plastic bags the EPA recommends wrapping a CFL in before disposal: 2
  • Operating life expected from LEDs: 50,000, and soon to 100,000, hours

LEDs are likely to be the future of energy-efficient lighting. But we’re not there yet. The chief factor restricting more widespread LED adoption: high price.