Step 1.
Calculate the total kilowatts saved by replacing the inefficient
lamps with more efficient lamps |
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Enter Original Lamp Wattage |
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Enter Replacement Lamp Wattage |
-
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Watts Saved per Lamp
=
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Enter Numbers of Lamps to
replace |
x
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Total Watts Saved =
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Total Kilowatts Saved
=
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Step 2.
Calculate the total kWh per year saved by this upgrade |
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Total Kilowatts Saved |
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Enter Hours Used per Day |
x
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Enter Days Used per Week |
x
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Enter Weeks Used per Year |
x
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Total kWh Saved per
Year =
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Step 3.
Calculate the total energy costs saved per year by this upgrade |
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Total kWh Saved per
Year |
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Enter Your Energy Cost per
kWh (typically $.10) |
x
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Total Energy Cost
Savings per Year =
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Step 4.
Compute the payback of the upgrade |
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Enter Initial Cost of Lighting
Upgrade |
$
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Total Energy Cost
Savings per Year |
/
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# of Years for Payback
on Investment =
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