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Lighting ROI Calculator



Find Payback
from costs & interest
with LED Lighting


Please read: This calculator gives payback time, and both the annual and life-time cost & savings figures for energy, maintenance, and CO2 production.  It calculates Lighting Power Density from area of at least 500 square feet per fixture, and provides the maximum fixtures allowed from a target LPD.  Check the DOE for your requirement.  Non-residential electric usually has additional cost for lower than 90% Power Factor.
          Calculator will not perform properly if removed from this site. 
   ENSURE THAT LIGHTING REPLACEMENT HAS EQUIVALENT PERFORMANCE.
 
        Comparisons        Show LPD        Compare CO2        Cookies
   
   Select
      If residential lighting, enter 95 for PF (Power Factor).
Simple Comparison Options
(Not photometric)         

Original
Restore
Defaults

LED
 
 
  Cookie Jar  
  
     

Parameters for energy statistics:  
Enter: Power Consumption, Power Factor, & No. of Fixtures
Orig. W  & PF % LED W Quantity 
 Totals:          Cost  $/ kWhr  
Hours/Day  ×   Days/Wk  ×   Weeks/Yr 
Annual Energy Cost: Original
$
LED
$
 
Savings:    Annual = $     Monthly = $      %
LPD (Lighting Power Density) = Watts÷SqFt
 SqFt per Fixture =  Total
Target LED LPD =  fixtures  
LPD Statistics      W/SqFt
Original LPD      
new  LED LPD      
=  Saved      
Click for suggested LPD (see that Table 1)
 
Fuel:   Coal    Gas    Petrol    Hydro    Nuclear 
 
Results:  Payback time, ROI, Savings, Cost & Interest
CO2 reductions
 Tons Less / year
 Tons Less / lifetime
    Annual Savings:
             
  Investment ÷ (Energy + Maint. Savings)
                 $ ÷ $  =  Year Payback 
Simple ROI(saved energy & maint. −Investment)÷Investment = % 
           Annual ROI:            LED to Original cost:  
   Payment Count Choice:  by savings, or,      by selection.
 (define Lease or Finance program)      $
   
  LED Investment: (LED maintenance is cleaning, inspection, etc. as should be done with all lighting.)  
  LED Life  Hours ÷   Hours/Year  =  Years Lifetime     Saves $ Energy  
 Full Installed Cost Discounts for  1 Fixture = $ Interest 
LED Maintenance Interval:  Years @ $  per Visit.  [ Lifetime ÷ Interval × Cost × Quan.= $ ]
($ × ) + $ = $  + FIXED JOB COSTS $  = $ Investment
  Subtract a rebate from FIXED JOB COSTS, or, enter negative (-)JOB COSTS if rebate only.   
  Original fixture with lifetime maintenance and energy costs:  
  Original fixture life  Hours ÷  Hrs/Year =  Yrs Lifetime     $  One Fixture Installed Cost  
Years × $ annual energy = $  Relamp $(relamping, disposal, cleaning, etc. every  years)
 $  + $ energy = $  Orig. Cost during LED Lifetime, repaired  times.  
 
 *US national average CO2 emissions caused by various power generation capabilities, value provided by the US EPA. 
            Home             ©2011-2014 Patrick Mullins     Please Contact me with any comments regarding this calculator.