In the US, one kilowatt-hour (3.6 MJ) of electricity currently causes an average 1.34 pounds (610 g) of CO
2 emission. Assuming the average light bulb is on for 10 hours a day, a 40-watt bulb will cause 196 pounds (89 kg) of CO
2 emission per year. The 6-watt LED equivalent will only cause 30 pounds (14 kg) of CO
2 over the same time span. A building’s carbon footprint from lighting can therefore be reduced by 85% by exchanging all incandescent bulbs for new LEDs if a building previously used only incandescent bulbs.
In the US , one kilowatt - hour ( 3.6 MJ ) of electricity currently causes an average 1.34 pounds ( 610 g ) of CO 2 emission . Assuming the average light bulb is on for 10 hours a day , a 40-watt bulb will cause 196 pounds ( 89 kg ) of CO 2 emission per year . The 6-watt LED equivalent will only cause 30 pounds ( 14 kg ) of CO 2 over the same time span . A building ’s carbon footprint from lighting can therefore be reduced by 85 % by exchanging all incandescent bulbs for new LEDs if a building previously used only incandescent bulbs .
A 6-watt LED left on for 10 hours a day will emit how much CO 2?
A 6-watt LED left on for 10 hours a day will emit how much CO 2 ?
30 pounds
30 pounds