Please read: Light levels are NOT calculated or suggested.
This calculator gives payback time, and both the annual and life-time savings figures for energy, maintenance, and CO2 production.
It calculates Lighting Power Density from area of at least 50 square feet per fixture, and provides the maximum fixtures allowed from a target LPD. It's not exclusive to
LED, can compare any lighting.
Simple ROI is calculated on product lifetime with the industry standard [ (Payback – Investment) ÷ Investment ×100 ] formula.
Cost may be full direct if retrofit, or may be difference (Original - New) if complete new installation.
Include ALL COSTs and verify calculations before implementing a solution. Check with your electric utility provider for rate structures related to Lighting Power Density (LPD/UPD). Site owner not responsible for errors, misapplications or oversights.
*US national average CO2 emissions caused by various power generation capabilities, value provided by the US EPA.