Stairwells, corridors, parking structures, storage rooms. These spaces share one characteristic: they’re lit 24 hours a day for an occupancy rate that rarely exceeds 15%. The math is simple — you’re paying to illuminate empty rooms. Occupancy-based lighting solves this, and the return on investment is measured in months, not years.
The Cost of Always-On Lighting
Consider a typical 200-fixture stairwell and corridor installation in a multifamily or commercial building. At an average of 40W per fixture running 24 hours a day, 365 days a year, that’s:
- 200 fixtures × 40W = 8,000W continuous load
- 8 kW × 8,760 hours/year = 70,080 kWh/year
- At $0.18/kWh (national average) = $12,614/year in lighting energy alone
The Department of Energy estimates that common areas in commercial buildings are occupied only 10–30% of operating hours. In stairwells, that number drops to under 5%. You’re paying full price for lighting that nobody is using 70–95% of the time.
How Occupancy Sensors Work: Three Technologies Explained
Not all occupancy sensors are created equal. The Occu-Smart platform offers three sensor technologies, each optimized for different space types and detection requirements:
Emits high-frequency sound waves and detects motion via Doppler shift. Detects movement behind obstacles. Best for restrooms, open offices, and irregular layouts.
Microwave-based detection through lightweight materials. Detects presence through drywall partitions. Best for corridors, stairwells, and enclosed spaces.
Detects body heat (infrared radiation) from moving occupants. Most common sensor type. Best for defined paths, doorways, and single-direction traffic.
Many Occu-Smart models use dual-technology sensing (combining two methods) to eliminate false triggers and missed detections. The VOL GEN6 flagship, for example, combines HF microwave with passive IR for corridor applications.
Real-World Savings Data: 40–60% Energy Reduction
Across 500,000+ installed units, Occu-Smart consistently delivers 40–60% energy savings compared to always-on lighting. The variance depends on space type and occupancy patterns:
| Space Type | Typical Occupancy Rate | Measured Energy Savings |
|---|---|---|
| Stairwells | 3–8% | 55–65% |
| Parking structures | 10–25% | 50–60% |
| Corridors / hallways | 15–30% | 40–55% |
| Storage / utility rooms | 2–5% | 60–75% |
| Restrooms | 10–20% | 45–55% |
Storage rooms and stairwells deliver the highest ROI because they have the lowest occupancy rates — 95%+ of the time, you’re lighting an empty space. Occu-Smart drops those fixtures to standby levels until someone walks in.
Sample ROI: 200-Fixture Corridor & Stairwell Retrofit
Here’s a representative ROI calculation for a 200-fixture retrofit in a multifamily residential building, replacing always-on 4’ fluorescent fixtures with Occu-Smart LED fixtures with integrated occupancy sensors:
200-Fixture Retrofit ROI Calculation
Assumptions
Annual Energy Cost
Payback
After payback, the building owner captures $8,198 per year in ongoing savings for the remaining fixture life (50,000+ hours = ~5.7 years continuous). Total 10-year net savings after fixture cost: $57,980.
The Bluetooth Advantage: Commission Once, Adjust Anytime
Traditional occupancy sensors are set at the factory or adjusted with tiny DIP switches on the fixture — requiring a ladder, a flashlight, and patience. If tenants complain about sensitivity, time delay, or standby light levels, you’re sending a technician to each fixture individually.
Occu-Smart’s VOL GEN6 and other Bluetooth-enabled models solve this with a free iOS and Android app that connects directly to each fixture via Bluetooth 5.0. From the ground level, maintenance staff can adjust:
- Time delay: How long the fixture stays at full output after the last detected motion (adjustable from 30 seconds to 30 minutes)
- Standby dimming level: The light level maintained when no occupancy is detected (adjustable from 0% to 50%)
- Sensitivity: Detection threshold to avoid false triggers from HVAC airflow or adjacent spaces
- Daylight harvesting: On models with ambient light sensors, the target light level for daylight-responsive dimming
No rewiring. No ladders for commissioning changes. No truck rolls for parameter adjustments. This alone reduces commissioning costs by an estimated 60–70% compared to traditional hardwired sensors.
500,000+ Units Installed: America’s Most-Deployed Occupancy Platform
Occu-Smart isn’t a theoretical product — it’s the most-deployed occupancy sensor LED platform in the country, with over 500,000+ units installed across multifamily housing, commercial buildings, healthcare facilities, education campuses, parking structures, and municipal buildings.
The platform includes 10 product families covering every common-area application:
- VOL GEN6 (flagship) — Bluetooth 5.0, HF/IR dual-sensor, surface/recessed mount
- CNOS — Compact narrow occupancy sensor for tight corridors
- TTU / TTH — Troffer-style for drop ceilings
- DLLR-IR — Downlight with passive IR
- SSLED-IR / SSLED-HF — Stairwell-specific with IR or HF sensing
- SUNLD — Sundisk LED for round ceiling applications
- DL — Standard downlight with occupancy
- VOLH — High-output variant for high-bay applications
Every fixture is manufactured in Clear-Vu’s 100,000 sq ft Central Islip, NY facility. DLC-qualified for utility rebates. BABA/BAA compliant for federally-funded projects. UL listed.