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Occupancy Sensor Lighting Payback Calculator

Motion/occupancy sensors cut lighting runtime 30-70% in common areas.

Fixtures

Fixture watts

Current hours / yr

Sensor $/fixture

Hours reduction %

$/kWh

Payback months

116.6

Annual savings

$386

Total cost

$3,750

How the math works

Hours saved = current × reduction. Savings = fixtures × watts × hrs saved / 1000 × rate.

30 × 30 × 3,575 / 1000 × $0.12 = $386/yr. $3,750 cost. 116.6 months (9.7 yr).

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Occupancy Sensor Lighting Payback Calculator is built to give a quick, browser-based estimate for occupancy sensor lighting payback. Motion/occupancy sensors cut lighting runtime 30-70% in common areas. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the occupancy sensor lighting payback result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this occupancy sensor lighting payback estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter fixtures.
Enter fixture wattage.
Enter current run hours.
Enter sensor cost per fixture.
Enter run hours reduction %.
Enter electricity rate.
Read payback.

Frequently Asked Questions

Best applications?

Storage rooms: 70-90% runtime reduction. Stairwells: 60-80%. Bathrooms: 50-70%. Offices: 30-50%. Corridors (residential): 40-60% (safety lighting at dim-down). Amenity rooms (gym, game room, etc.): 50-70%. Parking garages: 30-50%. Always-on (lobbies, primary circulation): exclude.

Cost?

Simple PIR sensor (passive infrared): $25-80 each. Dual-technology (PIR + ultrasonic): $60-150 each. Installation: $50-200 per sensor. Retrofit integration with existing fixtures: $5-40 additional. Average per-fixture retrofit: $75-200 total. Volume discount 20-40% on large projects.

Controls evolution?

Basic occupancy sensor: on/off based on motion. Advanced: dim-down to safety level when unoccupied. Connected/networked: centralized reporting + schedule + integration. Wireless mesh: retrofit without rewiring. Enterprise lighting control (Lutron, Acuity, Daintree): full scheduling + tuning. Capex scales 2-5× from basic to networked.

Codes + rebates?

ASHRAE 90.1, CA Title 24, IECC: require occupancy sensors in many spaces for new construction. Retrofit: voluntary but common for code-compliant upgrades. Rebates: prescriptive $15-75 per sensor typical. DLC (DesignLights Consortium) qualified products. 179D deduction: qualifying retrofit. Utility demand response: advanced sensors enabling DR get $100-500/sensor additional incentive.