What a lighting retrofit evaluation includes
A retrofit evaluation turns an existing lighting system into a scope. It does not start with a savings percentage. It starts with what is on the ceiling, what the work needs, and what a replacement would actually draw. The commercial LED retrofit page is the service; this guide is the checklist behind it.
What gets recorded in the existing-fixture audit?
Fixture or lamp type, quantity, wattage from a nameplate when it is readable, mounting height, and condition. Photos down a typical bay or aisle matter because a count without a picture of obstructions is hard to lay out. Voltage and emergency fixtures are noted when they are visible or the owner can point to them.
If the wattage is not readable, it stays unknown. Substituting a “typical” wattage would make any later energy comparison look more precise than it is. Avision would rather leave the cell blank.
How should an energy comparison be built?
Existing watts times hours, compared with proposed watts times the same hours, plus a note about controls that change the hours. That is the whole method. Demand charges, rebates, and maintenance labor can be discussed only when the owner supplies the rate or the labor reality. A percentage copied from another project is not a method.
Photometrics answer a different question: will the new layout put light where the work is? A layout that saves energy and misses the pick face is a failed retrofit. Light levels come from the task and the geometry, then from the calculation — not from a single foot-candle slogan.
What does commissioning prove?
That the fixtures aimed where the layout said, that controls recall the zones that were sold, and that emergency operation still does what it did before the swap. Commissioning is part of the retrofit, not a separate luxury.