Step 1.
Calculate the total kilowatts saved by replacing the inefficient
lamps with more efficient lamps 

Enter Original Lamp Wattage 




Enter Replacement Lamp Wattage 





Watts Saved per Lamp
=



Enter Numbers of Lamps to
replace 
x




Total Watts Saved =



Total Kilowatts Saved
=


Step 2.
Calculate the total kWh per year saved by this upgrade 

Total Kilowatts Saved 




Enter Hours Used per Day 
x




Enter Days Used per Week 
x




Enter Weeks Used per Year 
x




Total kWh Saved per
Year =


Step 3.
Calculate the total energy costs saved per year by this upgrade 

Total kWh Saved per
Year 




Enter Your Energy Cost per
kWh (typically $.10) 
x




Total Energy Cost
Savings per Year =


Step 4.
Compute the payback of the upgrade 

Enter Initial Cost of Lighting
Upgrade 
$




Total Energy Cost
Savings per Year 
/




# of Years for Payback
on Investment =

