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

(1) Original Lamp Wattage

-

(2) Replacement Lamp Wattage

=

(3) Watts Saved per Lamp

x

(4) # of lamps to replace

=

(5) Total Watts Saved

=

(6) Total Kilowatts Saved
Step 2. Calculate the total kWh per year saved by this upgrade

(7) Hours Used per Day

x

(8) Days Used per Week

x

(9) Weeks Used per Year

=

(10) Total kWh Saved per Year
Step 3. Calculate the total energy costs saved per year by this upgrade

x

(11) Your Energy Cost per kWh (typically $0.10)
$

=

(12) Total Energy Cost Savings per Year
Step 4. Compute the payback of the upgrade

(13) Initial Cost of Upgrade
$

/

(14) Total Savings per Year
$

=

(15) # of Years for Payback

Note: Calculations on this page represent estimated values.