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Incandescent Lamps vs. Cost Effective Energy Saving GU24 CFL

 

The following table illustrates the energy savings when transitioning from a 60-watt or 100-watt incandescent lamp to a GU24 Compact Fluorescent Lamp (CFL).

 

  ProSeries GU24 Utility Lighting Specs

 

Calculate Your Annual Energy Savings
	Incandescent Lamp		GU24 CFL
	60 watts	100 watts	23 watts
Estimated Daily Usage (in hours)	24	24	24
KWh of Electricity used per Day	1.44 KWh	2.4 KWh	0.552 KWh
Days per Year	365	365	365
Annual KWh of Electricity Used	525	870	201
Annual Electricity Cost (@ $0.07 per KWh per day)	$36.79	$61.40	$14.10
Hours of Operation per Year1	8,760	8,760	8,760
Average Lamp Life (in hours)2	1500	1500	10,000
Total Number of Lamps Needed (per Year)	5.84	5.84	.876
Lamp Cost3 (Single Unit Trade Price)	$.78	$.78	$6.07
Total Costs of Lamps (per Year)	$4.56	$4.56	$5.32
Annual Electricity Cost	$36.79	$61.40	$14.10
Total Costs of Lamps (per Year)	$4.56	$4.56	$6.07
Annual Electricity Cost + Lamp Cost	$41.35	$65.96	$20.17
Annual Energy Savings per Year4	$21.18	$45.79	n/a

 

¹ 8,760 = 24 hours per day x 365 days per year.
² Estimated "rated" average lamp hours. Actual lamp hours or operation will vary by manufacturer.
³ The average single unit trade price. The actual price of the lamp will vary by manufacturer.
⁴ Annual Energy Savings per Year is determined by subtracting the Annual Electrical Cost + Lamp Cost of the GU24 Compact Fluorescent Lamp from the Annual Electricity Cost + Lamp Cost of either the 60 or 100 Watt Incandescent Lamp.

   

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