Fighting Global Climate Change

 
CFL Energy Savings

Incandescent Bulb
x
Equivalent CFL
Savings
x
100 Watt Bulb
=
23 Watt CFL
$82 X
 

Money: $0

CO2 (lbs): 0
Cars: 0
Trees: 0
75 Watt Bulb
=
19 Watt CFL
$61 X
 
60 Watt Bulb
=
14 Watt CFL
$51 X
 
40 Watt Bulb
=
9 Watt CFL
$36 X
 

How are the savings calculated?

 

Energy Savings Formula:

 

life expectancy of bulb x energy costs per Kwh x wattage
+
cost of bulb(s)
=
total cost of ownership
1000

Examples:
Traditional Bulb:
10,000 hours x $0.10 per Kwh x 100W
+
$0.75 x 13-1/3 bulbs
=
$110
1000
Compact Fluorescent Bulb:
10,000 hours x $0.10 per Kwh x 23W
+
$5.00 x 1 bulb
=
$28
1000
Difference:
$82 in savings over the life of the bulb

 

CO2 Savings Formula:
(Incandescent Watts – CFL Watts) x life of CFL bulb x 1.45 lbs
1000

*1.45 LBS is the amount of CO2 generated by 1 kWh of electricity (from US Energy Information Administration).
*You must divide by 1,000 to convert watts into a kilowatts.

 

Equivalent of CARS taken off of the road Formula:

CO2 Savings x  number of bulbs
118,083

*118,083 are the average CO2 emissions over the life of a car that would be generated (from US Department of Transportation).

 

Equivalent of TREES planted Formula:

CO2 Savings x number of bulbs
2932

*2932 is the amount of CO2 absorbed by trees over the 100 year life in pounds.

 

Assumptions:*
10,000 hours - the typical life expectancy of a CFL bulb.
$5.00 - the average price of a single CFL bulb.
750 hours - the typical life expectancy of an incandescent bulb.
$0.75 - the average price of a single incandescent bulb.
$0.10 - the average cost of energy per kilowatt hour (Kwh).

*can vary depending on region and type of bulb used