One 20 watt compact fluorescent lamp replaces 13.3 standard 75 watt lamps
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Standard |
Compact Fluorescent |
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Type of Lamp/Fixture |
75 W Std. |
20 W CFL |
Old Lumens/Watt |
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Watts per Lamp/Fixture |
75 |
20 |
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Purchase Cost Lamp/Fixture |
$0.50 |
$15.00 |
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Cost to Change Lamp/Fixture |
$1.00 |
$1.00 |
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Life of Lamp in Hours |
750 |
10,000 |
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Lumens Output |
1,190 |
1,200 |
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One Proposed |
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Calculation Data |
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Energy Rate ($/KWh) |
$0.060 |
$0.060 |
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Demand Rate ($/Kw Month) |
$8.000 |
$8.000 |
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Electricity Calculations |
75 W Std. |
20 W CFL |
kWh, kW Savings |
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Total Kwh Used |
750 |
200 |
550 |
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Kw Demand (Monthly) |
0.075 |
0.020 |
0.055 |
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$ Saving Calculations |
75 W Std. |
20 W CFL |
Dollar Savings |
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$ for Purchasing Lamps |
$7 |
$15 |
-$8 |
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$ for Changing Lamps |
$13 |
$1 |
$12 |
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$ for kW |
$24 |
$6 |
$18 |
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$ for kWh |
$45 |
$12 |
$33 |
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$ Total |
$89 |
$34 |
Total $ Savings $55 |
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Added 1/3 air conditioning benefit (if applicable) |
$17 |
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Total Dollar Savings (including A/C savings) |
$72 |
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CO2 Calculations |
75 W Std. |
20 W CFL |
CO2 Savings |
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Coal Generation* |
1,778 |
474 |
1,304 |
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All Generation** |
1,155 |
308 |
847 |
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*Coal Generation = 2.37 lbs CO2/KWh. |
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**Average USA generation from all resources = 1.54 lbs CO2/KWh |
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