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Actual volume of carbon dioxide emissions from powering a lightbulb
Image by Carbon Visuals
Comparison of the actual volume of carbon dioxide gas emitted as the result of illuminating a 60 W incandescent bulb, an equivalent compact fluorescent bulb (14 W) and an equivalent light emitting diode bulb (7 W) for 24 hours using US grid electricity. The volume representing the compact fluorescent bulb is a cube 1” 6” high. The other volumes have the same base area.
Incandescent bulb: 60 W x 24 hours = 1.44 kWh = 0.798 kg CO2(e) Compact fluorescent bulb: 14 W x 24 hours = 0.336 kWh = 0.186 kg CO2(e) LED bulb: 7W x 24 hours = 0.168 kWh = 0.093 kg CO2(e)
The conversion coefficient used is 0.554 kg.CO2(e)/kWh which is a weighted average of the coefficients reported for each eGRID subregion for 2009 (weighted by total energy output and emissions).
Source: October 2012, ‘eGRID2012 Version 1.0 with Year 2009 Data Released’
www.epa.gov/cleanenergy/documents/egridzips/eGRID2012_yea… alSupportDocument.pdf
The calculation assumes that power delivered to a compact fluorescent bulb is equivalent to that delivered to incandescent bulbs and LED bulbs. In fact there is a subtle difference, which means the emissions from the compact fluorescent bulbs is an underestimate. Because compact fluorescent bulbs have a power factor that is less than 1, more current flows along the transmission wires (see: en.wikipedia.org/wiki/Power_factor). This means that the transmission losses (energy lost as electricity is delivered to homes) are greater for a14 Watt energy saving bulb than they would be for a 14 Watt incandescent bulb or LED bulb, and so a bit more carbon dioxide will be emitted. However, the transmission losses are a small percentage of the total load so the difference is small.
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