Lighting Calculator

If you are considering a lighting upgrade, this simple calculator can help you determine your potential energy cost savings. To begin, use the dropdowns in the left column to select your Existing Lighting Fixtures. If you are upgrading your lighting, use the dropdowns on the right to select your Upgrade Lighting Fixtures. After you have entered your information, click the Calculate button.

The output of the Lighting Calculator provides energy use and cost analysis plus a cost savings estimate for upgrades. If necessary, the operating hours can be modified to more closely match your situation.

For simplicity, average watt values are used for comparing lamp/ballast/fixture combinations. When considering a lighting upgrade, be sure to compare wattage, lumen output, CRI, ballast factor and other lighting characteristics for best results. A Lighting Terminology Guide is provided for reference.

Operating hrs
5 days/wk 7 days/wk
Existing Lighting Fixture
Lamp Kind
Lamps per Fixture
Number of Fixtures
Upgrade Lighting Fixture
Lamp Kind
Lamps per Fixture
Remove Add New
Electricity Cost ($/kWh)
Qty Existing Lamp Type Annual Operating Hours Annual Operating Cost ($) Lamp Upgrade Annual Operating Cost ($) Annual Operating Savings ($) Rebate Amount
Calculate Modify