Commercial LED Lighting Retrofit ROI: What Milwaukee Businesses Need to Know
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Most commercial facility managers and property owners know that LED lighting is more efficient than fluorescent. What fewer people know is exactly how much more efficient, what the real payback period looks like for a commercial building in Wisconsin, and how to evaluate whether a retrofit makes sense for their specific facility before committing to the project.
This guide breaks down the actual numbers, walks through the factors that affect ROI, and explains how Wisconsin's utility rebate programs factor into the calculation — so you can make an informed decision rather than taking a contractor's word for it. If you're ready to get a quote for your facility, our commercial lighting retrofit team serves businesses across Milwaukee and southeastern Wisconsin.
A commercial LED lighting retrofit is the process of replacing existing fluorescent, HID, or other legacy lighting fixtures in a commercial building with modern LED fixtures — along with any associated controls upgrades such as occupancy sensors, daylight harvesting controls, or programmable dimming systems.
A retrofit can range in scope from replacing tubes in existing fixtures (a lamp-only retrofit) to completely swapping out fixtures, ballasts, and controls across an entire facility. The right approach depends on the age and condition of your existing fixtures, your energy savings goals, and the rebate programs available in your area. It's also worth noting that a lighting assessment often surfaces other electrical issues — our commercial electrical service and maintenance team can address those as part of the same project.
The efficiency gap between commercial fluorescent and LED lighting is significant — and the numbers bear it out consistently across facility types.
Most commercial facilities running T8 or T12 fluorescent lighting see a reduction in lighting energy consumption of between 40% and 60% after a full LED retrofit. Facilities running older HID fixtures — common in warehouses, manufacturing floors, and parking structures — often see reductions of 60% to 75% or more, because HID technology is substantially less efficient than even older fluorescent systems.
Here's how that translates for a real commercial facility:
These are representative estimates based on typical facility configurations — your actual numbers will depend on current fixture types, hours of operation, and the specific LED products selected. You can browse examples of the types of commercial facilities we've worked on in our project portfolio.
The payback period on a commercial LED retrofit is determined by three variables: the cost of the installation, the annual energy savings in dollars, and any rebates or incentives that reduce the upfront cost.
The formula is straightforward:
Payback Period = (Total Installation Cost − Rebates) ÷ Annual Energy Savings
For a 50,000 square foot warehouse in Milwaukee running 16 hours a day, the math might look something like this:
After that payback period, the facility is generating pure savings for the remaining life of the fixtures — which for quality commercial LED products is typically 15 to 25 years. The long-term return on a well-executed commercial lighting retrofit is substantial.
Wisconsin's Focus on Energy program offers commercial and industrial customers of participating utilities significant rebates on qualifying LED lighting upgrades. These rebates directly reduce the upfront cost of the project and are one of the most important factors in improving the payback period on a retrofit.
Rebate amounts vary based on fixture type, wattage reduction, and the specific utility serving your facility. Common qualifying upgrades and approximate rebate ranges include:
A few things to know about the Focus on Energy rebate process:
At Kohl Electrical Services we handle the rebate process as part of every lighting retrofit project — identifying eligible fixtures, ensuring the products we specify meet requirements, and submitting the documentation on your behalf. Contact us to discuss your facility's eligibility.
Not every facility will see the same return, and it's worth understanding the variables that push the numbers up or down before you commit to a project.
Hours of operation are the single biggest driver of ROI. A facility running lights 20 hours a day will see dramatically faster payback than a facility running 8 hours a day, because the energy savings accumulate faster. Warehouses, manufacturing facilities, and 24-hour operations tend to see the strongest returns.
Current fixture type matters significantly. If you're replacing T8 fluorescent with LED, the efficiency gain is meaningful but moderate. If you're replacing older T12 fluorescent or HID fixtures — metal halide, high-pressure sodium, or mercury vapor — the efficiency gain is substantially larger, and the ROI is correspondingly better.
Utility rate affects dollar savings directly. Wisconsin commercial electricity rates vary by utility and by rate class, but most commercial customers pay between $0.09 and $0.14 per kWh for energy. Higher rates mean larger dollar savings from the same kWh reduction.
Controls integration can add meaningful savings on top of the fixture swap. Occupancy sensors that turn lights off in unoccupied areas, daylight harvesting controls that dim fixtures near windows, and scheduled dimming in low-traffic periods can add another 10% to 25% on top of the base LED savings — and many of these controls qualify for additional Focus on Energy rebates.
Electrical infrastructure sometimes needs to be addressed alongside the lighting retrofit itself. Older panels and distribution equipment may need upgrades to support a new lighting system efficiently — our electrical gear and equipment team handles that work as part of the same project scope.
A well-run commercial LED lighting retrofit follows a clear process from initial assessment through final commissioning. Here's what to expect:
Assessment and recommendation — A qualified electrical contractor visits your facility, documents existing fixture types and quantities, measures current energy consumption, and develops a retrofit recommendation with product specifications, projected savings, rebate amounts, and project cost.
Rebate pre-approval — Before any work begins, the rebate application is submitted and pre-approved by Focus on Energy. This locks in the rebate amount and confirms the specified products qualify.
Procurement — Fixtures are ordered through established supply channels. Lead times on commercial LED fixtures are generally short — most standard products ship within one to two weeks.
Installation — Installation is scheduled around your facility's operations, by zone or by shift, to minimize disruption. A warehouse retrofit might be completed zone by zone over several nights; an office retrofit might be done floor by floor over a long weekend.
Commissioning and verification — After installation, every fixture is verified, controls are programmed and tested, and energy consumption is measured to confirm the savings are tracking as projected. You can see examples of completed commercial projects across Milwaukee and southeastern Wisconsin in our projects gallery.
A lighting retrofit makes the most financial sense when:
It makes less sense when:
Commercial LED lighting retrofit costs vary significantly based on facility size, fixture count, fixture type, and whether controls are included. As a rough benchmark, most commercial retrofit projects fall between $8 and $25 per square foot for a full fixture replacement including installation. Lamp-only retrofits cost considerably less. The best way to get an accurate number for your facility is a site assessment and proposal from a qualified electrical contractor — our lighting retrofit team provides this as part of the proposal process at no charge.
Quality commercial LED fixtures are rated for 50,000 to 100,000 hours of operation, compared to 15,000 to 30,000 hours for T8 fluorescent tubes. In practical terms, a LED fixture running 16 hours a day in a warehouse has a rated lifespan of 8 to 17 years before reaching 70% of original lumen output — the standard measure of LED end-of-life. Beyond the energy savings, the maintenance cost reduction from eliminating ongoing lamp and ballast replacements is a meaningful secondary benefit, and one that pairs well with a broader commercial electrical maintenance program.
It depends on the age and condition of your existing fixtures. Lamp-only retrofits — replacing fluorescent tubes with LED tubes — are lower cost and lower disruption, but they leave aging ballasts in place, which continue to consume energy and will eventually fail. Full fixture replacements eliminate the ballast entirely, deliver better light quality and distribution, and typically qualify for larger Focus on Energy rebates. For facilities with fixtures that are 15 or more years old, a full fixture replacement is almost always the better long-term investment.
A well-planned lighting retrofit should cause minimal disruption to your facility's operations. Experienced contractors sequence the installation by zone so that no area is without light for more than a short period, and schedule the most disruptive work during off-hours or on weekends. We've completed retrofits in fully operational manufacturing facilities, medical offices, and 24-hour distribution centers without meaningful operational interruption.
Yes — several financing options are available for commercial LED retrofits, including equipment financing through commercial lenders, property assessed clean energy (PACE) financing in eligible Wisconsin municipalities, and utility on-bill financing programs offered by some Focus on Energy participating utilities. Some projects are also structured as energy service agreements where the savings pay for the project over time. Contact our team and we can help point you toward the right financing structure for your situation.
A commercial LED lighting retrofit is one of the few capital investments a facility can make that delivers a measurable, predictable financial return with minimal operational risk. The technology is mature, the rebate programs are real, and the payback periods for most commercial facilities in Wisconsin fall well within a range that makes the decision straightforward.
The key is doing it right — proper fixture selection, a contractor who knows the rebate process, and an installation that's sequenced to minimize disruption. Our commercial lighting retrofit service covers the full scope: assessment, rebate application, procurement, installation, and commissioning.
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