What LED fixture wattage should I compare against my metal halide?

As a rule of thumb: 400W metal halide replaces with 150W-180W LED high-bay at similar light output. 1000W metal halide replaces with 300W-400W LED. 250W metal halide replaces with 100W-150W LED. Actual replacement wattage depends on fixture efficacy, mounting height, and footcandle target. The calculator defaults reflect typical one-for-one retrofit sizing.

Why does the calculator show payback but no guarantee of savings?

The calculator estimates savings under specific assumptions. Actual savings depend on fixture selection, installation quality, utility program eligibility, rate changes, operating schedule changes, and facility conditions. No online calculator can guarantee results. The numbers are a directional estimate to help you decide whether an LED retrofit is worth a formal assessment.

LED Lighting Cost Savings Calculator | Industrial Lighting GR

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

This LED savings calculator estimates your annual energy savings, payback period, and 10-year net return from an LED lighting upgrade. Enter your current fixture wattage, count, operating hours, electricity rate, and LED replacement data. The tool applies the standard formula: (current kW minus LED kW) times annual runtime hours times your kWh rate, minus net project cost after utility rebates.

Methodology: energy cost uses kWh = (watts / 1000) x fixtures x (hours/day) x (days/week) x 52 weeks. Payback is net project cost divided by annual savings. The calculator does not account for HVAC cooling load reduction or demand-charge reduction, both of which typically add to real-world savings.

Current Lighting

Current Fixture Type

Current Watts per Fixture Includes ballast losses. Auto-filled above, or enter custom.

Number of Fixtures

Hours of Operation per Day

Days per Week

Electricity Rate ($/kWh) Michigan commercial avg: $0.11-0.14/kWh

LED Replacement

LED Fixture Type

LED Watts per Fixture Auto-filled above, or enter custom.

Estimated Cost per LED Fixture (installed) Includes fixture and installation labor. Rough estimate only.

Estimated Utility Rebate per Fixture ($) Michigan: typically $30-80/fixture for high bays.

Your Projected LED Savings

Annual Energy Savings

$0

Per year after upgrade

Payback Period

$0

After utility rebates

10-Year Net Savings

$0

After all project costs

Energy Reduction

$0

Wattage reduction per fixture

Current Annual Energy Cost

$0

Lighting only

LED Annual Energy Cost

$0

After upgrade

Total Project Cost

$0

Before rebates

Net Project Cost

$0

After utility rebates

* This calculator provides estimates based on the inputs provided. Actual savings depend on local electricity rates, fixture selection, installation conditions, and utility rebate program eligibility at the time of project completion. Rebate programs and rates change, contact us for a current rebate estimate for your utility territory.

Calculator estimates are provided for informational purposes only and do not constitute a project quote or guarantee of savings. Actual results vary by facility and utility program.

What the Calculator Doesn't Capture

Energy savings are the most visible part of the LED ROI story, but they're not the whole picture.

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Maintenance Cost Elimination

Metal halide lamps need replacement every 3-5 years. For a 50-fixture facility, that means lamp costs, lift equipment rental, and labor every few years. LED fixtures run 10-15 years without lamp changes. These avoided costs can add 15-25% to the total ROI on top of energy savings, but they're harder to calculate without knowing your specific labor rates and lamp prices.

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HVAC Load Reduction

Legacy HID fixtures emit substantially more heat than LED equivalents. In air-conditioned facilities, this heat contributes directly to cooling load. Studies show LED retrofits can reduce facility cooling costs by 5-15% in air-conditioned spaces. This isn't in the calculator, but it's real money, particularly for office spaces, food-safe manufacturing areas, and any climate-controlled warehouse.

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Utility Demand Charges

Many commercial and industrial utility rates include a demand charge based on peak kW draw, not just kWh consumed. Reducing lighting wattage lowers your facility's demand, which can reduce demand charges significantly. In facilities with high demand charges (which is common in Michigan commercial accounts), demand savings can equal or exceed the energy savings shown in the calculator.

LED Savings Calculator FAQs

The calculator produces an estimate based on your inputs: current wattage, fixture count, runtime, electricity rate, LED replacement wattage, installed cost, and rebate amount. It assumes linear energy consumption with no HVAC or demand-charge effects. Real-world savings are typically higher because the calculator does not include cooling load reduction or demand charge reduction. For a verified projection, request a site assessment.

Michigan commercial rates typically fall between $0.11 and $0.14 per kWh for most Consumers Energy and DTE Energy commercial accounts. Large industrial accounts with time-of-use or demand-based rate structures may be different. For best accuracy, use the blended rate from your most recent utility bill (total charges divided by total kWh).

The rebate field is subtracted from the total installed project cost to produce the net project cost, which drives the payback period calculation. Michigan rebates commonly run $30 to $80 per high-bay fixture through Consumers Energy and DTE Energy Business Solutions programs. Rebate amounts change annually and by fixture type, so these are rough starting numbers only.

As a rule of thumb: 400W metal halide replaces with 150W-180W LED high-bay at similar light output. 1000W metal halide replaces with 300W