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energy savings tip

Make use of natural daylight. Before turning on the lights, check to see if there is sufficient sunlight. It’s free!

Incandescent Bulb   Equivalent CFL Savings  
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