The Real Math on LED Retrofits (and Why Most Rebate Estimates Are Off)

What 'rebate eligible' actually means

Every LED retrofit pitch shows a utility rebate as a line item — JEA's commercial rebate is typically $0.10–$0.25 per saved watt, capped at 50% of project cost. What the pitch doesn't show: rebate amount is calculated from the *manufacturer-stated* wattage delta, not the *measured* delta after install. So a 2x4 troffer replacement claiming 150W → 38W (112W saved) on paper might measure 145W → 42W (103W saved) after install because the existing fixtures were already running below nameplate, or the new driver runs higher than spec under your line voltage. Plan for 8–12% shortfall between projected and realized.

Where projected and realized diverge

Across commercial retrofits we've bid and installed, projected payback consistently runs shorter than realized payback. The gap comes from three predictable sources: the wattage delta shortfall above, the rebate being smaller than the pitch deck shows (more on that below), and projects taking longer than scheduled, which delays when savings actually start hitting the meter. None of this kills LED as an upgrade — median payback is still well under five years on most commercial buildings — but the pitch decks should be honest about it.

Why the rebate shrinks

JEA (and FPL, and most utility programs) calculate the rebate from a 'baseline' fixture that's the most efficient legal option, not the existing fixture. If your existing parking lot uses 400W metal halide and the LED replacement is 150W, the savings on paper is 250W — but the utility will calculate rebate against a 320W pulse-start metal halide as baseline (the most-efficient legal HID option), shrinking the rebate to a 170W delta. Pitch decks that ignore this overstate rebate substantially on parking lot retrofits specifically. Interior fluorescent-to-LED is fairer because the baseline calculation already assumes T8 lamps.

Controls integration is where the real savings live

Straight lamp-for-lamp retrofits give you meaningful wattage savings — typically more than half — which is good. Adding occupancy sensing and daylight harvesting on top gets you another substantial reduction, especially for spaces with intermittent use — conference rooms, restrooms, hallways, and exterior with photocell. The controls add roughly 10–15% to install cost but typically pay back within the original LED payback window — meaning you get controls effectively for free if you bundle them with the retrofit. Done after the fact, controls rarely pencil out.

How we bid LED honestly

Every LED bid we produce shows three numbers: wattage delta with a realistic discount on the manufacturer's headline figure, projected rebate using the utility's actual baseline (not the manufacturer's), and a payback window with controls integrated by default. If the bidder isn't showing you those three things, ask for them. The math is straightforward — what's hard is resisting the urge to show the optimistic version that wins the bid against a competitor who didn't bother.

LED retrofits still pencil out — most commercial buildings see real money inside a 5-year payback even on honest math. Just don't budget against the pitch deck. Apply a realistic discount on wattage delta, expect rebates to be smaller than the brochure on exterior fixtures, and bundle controls or skip them entirely.