Skip to content
Log in Calculators

LED Retrofit Savings Calculator

Before and after kWh, demand, and dollars for an LED retrofit of an existing lamp or fixture population.

Inputs

Scope

Luminaires in the retrofit scope.

Sets a typical input wattage. Replace it with the nameplate watts below when you have them.

Nameplate or measured input watts, driver loss included. Leave 0 to use the typical value for the source.

Input watts of the LED replacement, driver included, from the product datasheet.

Operation

Sets typical annual hours and a national average energy price.

Leave 0 to use the operating hours of the selected profile.

Leave 0 to use the national average price in the selected profile.

Additional effects

Additional savings only available after the retrofit: occupancy sensing, daylight dimming, scheduling, or high-end trim.

Annual maintenance saving from longer life, if you have already estimated it. Leave 0 to keep this screen to energy only.

Result

Energy after
—
Energy before
—
Energy saved
—
Reduction in energy
—
Annual energy saving
—
Energy cost after
—
Energy cost before
—
Total annual saving
—
Demand reduction
—
Existing watts per fixture
—
Operating hours used
—
Energy price used
—
Reading this result
—

What to check

  • Measured existing input watts, not the nameplate rating of a lamp that has aged
  • Retrofit input watts from the product datasheet at the same drive conditions
  • Whether the retrofit keeps the illuminance and uniformity the space needs

Related calculators

This calculator is a first-pass screen. Verify existing load by measurement or one-line diagram, confirm the replacement meets the illuminance requirement, and check the incentive programme rules before quoting a saving figure.

Saved calculations

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report anytime.

Sign in to save Create account

Sign in or create an account to save this calculation.