Light levels are NOT calculated here. ENSURE THAT REPLACEMENT HAS EQUIVALENT LIGHTING PERFORMANCE.
This calculator gives payback time, and both the annual and life-time cost & 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, and can compare any lighting.
The calculator will not perform properly if copied to a computer.
Updates and maintenance are done from the web site.