Calculator Inputs
Example Data Table
| Scenario | Old Watts | LED Watts | Fixtures | Hours Per Day | Rate | Fixture Cost | Rebate Each |
|---|---|---|---|---|---|---|---|
| Small Office | 64 | 24 | 75 | 10 | $0.14 | $48 | $8 |
| Warehouse | 250 | 105 | 160 | 14 | $0.12 | $120 | $20 |
| Retail Store | 90 | 38 | 210 | 13 | $0.18 | $62 | $10 |
Formula Used
Existing kWh = Existing watts × Fixtures ÷ 1000 × Hours per day × Days per year.
LED kWh = LED watts × Fixtures ÷ 1000 × Hours per day × Days per year × Controls factor.
Annual kWh saved = Existing kWh − LED kWh.
Energy savings = Annual kWh saved × Electricity rate.
Demand savings = Demand reduction kW × Demand charge × Demand billing months.
Net investment = Fixture cost + installation + other costs − rebates − credits.
Simple payback = Net investment ÷ first year total savings.
ROI = Total nominal savings − net investment, divided by net investment.
NPV = Present value of projected savings − net investment.
How To Use This Calculator
Enter the wattage of the existing fixtures and the proposed LED fixtures.
Add the fixture count, operating schedule, electric rate, and demand charge.
Include maintenance savings, project costs, rebates, and any salvage credit.
Adjust escalation, discount rate, and analysis years for long term planning.
Press calculate to view the result above the form.
Use CSV or PDF buttons when you need a saved report.
LED Lighting ROI Guide
Why LED Return Planning Matters
An LED lighting project can look simple at first. Yet the real value depends on hours, rates, maintenance, incentives, and demand charges. A strong calculator brings these details together. It helps owners compare old fixtures with efficient replacements. It also shows when the project starts paying back the original investment.
Energy Savings Are Only One Part
The largest saving usually comes from lower wattage. The calculator converts fixture watts into annual kilowatt hours. It then multiplies the saved energy by the utility rate. Controls can reduce the new fixture use further. Occupancy sensors, timers, and daylight dimming may cut waste in rooms that are not always occupied.
Cost, Rebates, and Payback
Return depends on net project cost. Fixture cost, installation, permits, disposal, and other setup expenses raise the investment. Rebates and incentives reduce it. Simple payback divides that net investment by first year savings. This is easy to understand. It is not the only measure, because future savings also matter.
Cash Flow and Long Term Value
A better review looks across several years. Energy prices may rise. Demand charges may continue every month. Maintenance savings may continue because LED fixtures last longer and need fewer lamp changes. Net present value discounts future cash flow, so distant benefits are not treated the same as money saved today.
Using Results Wisely
Use the result as a planning estimate. Check fixture counts carefully. Confirm operating schedules with staff or meter data. Ask the utility about demand billing and rebate rules. For large buildings, compare several scenarios. A higher fixture cost may still win if it cuts more energy, reduces maintenance, or qualifies for a larger incentive.
Before Approval
Review the assumptions before ordering fixtures. Small changes can move the payback date. A warehouse running every night will save more than a storage room used briefly. A high electricity rate also improves the case. Include lift rental, controls programming, and cleanup costs when they apply. Record the model numbers used in the estimate. This makes vendor quotes easier to compare. After installation, track bills and maintenance calls. Real measurements help prove savings and guide the next upgrade. Keep notes, photos, invoices, and utility screenshots with the final approval report.
FAQs
What is an LED lighting ROI calculator?
It estimates the financial return from replacing existing lighting with LED fixtures. It compares energy savings, demand savings, maintenance savings, rebates, project costs, payback, ROI, and net present value.
What does simple payback mean?
Simple payback shows how many years first year savings need to recover the net project investment. It is easy to read, but it does not include the time value of money.
Why include demand charges?
Many commercial bills include demand charges based on peak kilowatt use. LED upgrades can reduce peak load, so including demand charges gives a more complete savings estimate.
How do rebates affect ROI?
Rebates reduce the net investment. A lower investment usually improves payback, ROI, NPV, and benefit cost ratio. Always confirm current rebate rules before final approval.
What is the controls savings field?
This field estimates extra savings from sensors, timers, dimming, or daylight controls. It reduces projected LED operating use by the percentage entered in the calculator.
Can this calculator be used for warehouses?
Yes. Warehouses often have long operating hours and high wattage fixtures. Enter the fixture count, schedule, rates, maintenance costs, and installation costs for the specific site.
What does NPV show?
NPV shows the present value of future savings after subtracting the net investment. A positive NPV suggests the project creates value under the selected discount rate.
Are the results guaranteed?
No. Results are planning estimates. Actual savings depend on measured usage, utility rates, installation quality, fixture performance, maintenance records, and final incentive approval.