Lighting retrofit cost-effectiveness calculator

Enter your information into the highlighted yellow fields and see the savings/cost-effectiveness on the right

Data Entry
General Information
Cost per kilowatt-hour
Quantity of bulbs to be replaced
Average burn time per week
Lbs. of Carbon (CO2 equivalent) per kWh
Burn time hours per year
Existing Bulbs
Watts each
Total watts
kWh per year
Cost per year
Replacement Bulbs
Watts each
Material cost per bulb
Manufacturer's claimed lifespan (hours)
Total watts
kWh per year
Cost per year
Total cost of materials
Labor Costs
Labor/installation cost per bulb
Total cost of labor
Results
Annual Savings
(Unknown)
Watts
(Unknown)
 
(Unknown)
Kilowatt-hours
(Unknown)
%
(Unknown)
Pounds CO2
Lifetime Savings
(Unknown)
 
(Unknown)
Years expected life of lamps
(Unknown)
Lamp changes prevented
(Unknown)
Materials charges prevented
(Unknown)
Labor charges prevented
Cost Effectiveness
(Unknown)
Simple payback (years)
(Unknown)
Return on investment

Assumptions:
  • Existing bulbs are incandescent type lamps (including halogens)
  • Existing bulbs are at 50% of their expected life of 2000 hours
  • Existing bulbs cost $2.00 each
  • Default of 1.7 pounds CO2 per kWh based on electricity from coal-burning power plant
  • It costs the same amount in labor to replace an existing lamp as a proposed retrofit lamp
This calculator tool has been provided by Advanced Metrics Group