Warehouse LED Lighting Retrofit | Industrial Lighting GR

Industrial Lighting GR Editorial Commercial and industrial lighting writer, Grand Rapids MI Published: April 24, 2026Last updated: April 24, 2026

A warehouse LED lighting retrofit swaps aging metal halide, HPS, or T8 fluorescent fixtures for high-efficiency LED high-bays, linear strips, or vapor-tight fixtures. Industrial Lighting GR handles audit, photometric layout, Michigan and Midwest utility rebate filing, and installation. Most retrofits cut lighting energy costs 50 to 70 percent and pay back within 2 to 3 years.

What We Retrofit

We replace every major legacy lighting technology with commercial-grade LED fixtures engineered for industrial applications.

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Metal Halide Replacement

400W and 1000W metal halide high bays are the most common retrofit target in warehouses and manufacturing facilities. A 400W metal halide fixture draws 450+ watts with ballast losses and produces poor lumen maintenance over time. We replace them with 150-200W LED high bays delivering equal or better foot-candles at less than half the wattage. Instant-on, no warm-up, no restrike delay.

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High-Pressure Sodium (HPS)

HPS fixtures are common in older warehouses and outdoor applications. They produce poor color rendering (CRI 20-25) that makes it difficult to read labels, identify products, or spot safety hazards. LED replacements deliver CRI 70-80+ with significantly better color accuracy, improved worker visibility, and consistent output throughout the fixture's life without the gradual lumen depreciation HPS is known for.

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Fluorescent T8/T5 Retrofit

Strip fluorescent fixtures in lower-bay areas (under 15 ft) and office spaces are replaced with LED strip lights, LED troffers, or direct LED tube retrofits. Options include ballast-bypass direct-wire tubes, plug-and-play Type A tubes for existing ballasts, and full fixture replacement. Full fixture replacement delivers the best long-term ROI by eliminating ballast failure as a maintenance point.

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Vapor-Tight Fixture Upgrades

Cold storage, wash-down areas, and wet locations require IP65 or IP66 rated fixtures. We replace aging vapor-tight fluorescents with LED vapor-tight strip lights rated for the environment. These are common in food processing, refrigerated warehouses, breweries, and any facility where moisture, dust, or hosing down is part of routine operations.

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Parking Structure & Canopy

Low-bay parking decks and covered loading docks with HID or fluorescent fixtures are retrofitted with LED canopy lights or low-bay LED high bays. These environments often qualify for significant utility rebates due to the extended operating hours typical of 24/7 facilities. Retrofit kits are available for many existing fixture housings, reducing installation time and cost.

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Controls Integration

A retrofit is the best time to add occupancy sensors, daylight harvesting, and 0-10V dimming. Adding controls to an LED retrofit typically increases the rebate by 15-30% in Michigan and other Midwest utility programs while delivering an additional 20-40% reduction in lighting energy use beyond the fixture swap alone.

The Retrofit Process

We handle every step from initial assessment through installation and rebate filing. Here is what the process looks like for a typical warehouse retrofit project.

Site audit: We document existing fixtures, wattages, fixture counts, mounting heights, and current energy costs. This produces the data needed for an accurate ROI projection and rebate estimate.
Photometric layout: We run a foot-candle calculation for the space to confirm the proposed LED fixtures meet IES lighting standards for the application before ordering anything.
Rebate pre-approval: For Michigan and Midwest utilities, we handle the pre-approval submission before installation begins. Skipping this step means leaving rebate money on the table.
Installation: Fixture swap and controls wiring. Most warehouse retrofits are completed in one or two days with minimal operational disruption.
Rebate closeout: We file the post-installation rebate documentation and follow up with the utility to ensure payment is processed.
Commissioning and walkthrough: Final foot-candle verification and walkthrough with the facility manager to confirm everything is operating correctly.

Start Your Retrofit Assessment

Warehouse LED lighting retrofit installation

Retrofit vs. Full Replacement

Not every project calls for a full fixture replacement. Here is how to decide which approach makes sense.

Factor	Retrofit Kit	Full Fixture Replacement
Upfront Cost	Lower, reuses existing housing	Higher, new fixture and labor
Installation Time	Faster per fixture	Longer, full removal and remount
Long-Term Reliability	Still depends on aging housing/wiring	Best, all new components
Rebate Eligibility	Eligible in most programs	Eligible, sometimes at higher tier
Best For	Good-condition housings, tight budgets	Old or corroded housings, wet locations, new controls
Controls Upgrade	Limited by existing wiring	Easy to add 0-10V, sensors, DALI
Typical ROI	1.5-2.5 years after rebates	2-3 years after rebates

Retrofit FAQs

Most facilities replacing 400W metal halide high bays with 150-200W LED high bays see 50-60% reduction in lighting energy costs. Adding occupancy sensors and daylight controls pushes savings to 65-75%. A 100-fixture warehouse running 16 hours/day, 6 days/week can typically save $15,000-$25,000 per year depending on local electricity rates. Michigan commercial rates average $0.11-0.14/kWh, which is mid-range nationally.

Most warehouse retrofits can be completed in phases during off-hours or over a weekend. For facilities that run 24/7, we can typically work section by section to keep the majority of the space lit during installation. We'll discuss your operational schedule during the site audit and build an installation plan around your constraints.

Consumers Energy and DTE Energy both offer commercial and industrial LED rebate programs. Rebate amounts vary by fixture type, wattage reduction, and whether controls are included. In 2025-2026, standard high-bay LED retrofits have been eligible for $30-80 per fixture through these programs, with bonus tiers for controls integration and high-efficacy fixtures. We handle pre-approval and documentation as part of the retrofit project.

For like-for-like plug-and-play lamp replacements, a licensed electrician may not be strictly required depending on your local code. However, for any ballast bypass work, new circuit runs, controls wiring, or fixture replacement requiring wiring connections, a licensed electrician is required. Our installation teams are licensed and insured. We pull any required permits and handle inspections.

Request a Retrofit Assessment

Tell us about your facility and we will put together a no-obligation energy savings estimate, fixture recommendation, and rebate projection.