Credit: Photo by the Anchorage Museum
Incandescent vs. LED
These two bulbs produce the same amount of light, but use very different amounts of electricity to do it. The incandescent bulb on the right uses 100 watts of power to produce 1,600 lumens (or 16 lumens per watt). It would take 714 pounds of coal to power a similar bulb lit 24-hours-a-day for an entire year. The LED light on the left produces 150 lumens per watt - requiring only 10.7 watts of power, or 76.4 pounds of coal, to produce the the same amount of lumens of light 24 hours a day for a year.