This energy cost calculator allows users to enter custom inputs to estimate the simple payback period to replace incandescent lamps with compact fluorescent lamps.

Existing incandescent lamp wattage Watts
Incandescent lamp cost dollars
Incandescent lamp life hours
calc wattage
calc cost dollars
calc life (6000 hours for moderate use, 10000 hours for high use) hours
Number of lamps in retrofit project
Hours operating per week hours
Average cost of electricity $/kWh
Relamper labor costs $/hr
Time taken to retrofit all lamps in this project min
Time taken to relamp one lamp min
Type of Relamping Practiced:
Group Relamping:
Spot Relamping: