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U.S. Department of Energy Energy Efficiency and Renewable Energy

Energy Cost Calculator for Compact Fluorescent Lamps


This tool calculates the payback period for your calc retrofit project. Modify the default values to suit your project requirements.

Existing incandescent lamp wattage Watts
Incandescent lamp cost dollars
Incandescent lamp life hours
calc wattage
Watts
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:
months
Spot Relamping:
months