Quick Answer:

An occupancy sensor lighting system is a lighting infrastructure that uses embedded sensing technology to detect whether a space is occupied — activating lighting when occupancy is detected and switching off or dimming when the space is genuinely vacant, without manual intervention. TRUEiSENSE, India's No.1 True Presence Technology brand, offers the most advanced occupancy sensor lighting systems available in India: standalone true presence sensors using 24GHz FMCW radar with breathing detection (Rs. 3,499-Rs. 4,299) for offices, hospitals, and cabins; and integrated sensor lighting products (Rs. 1,449-Rs. 9,499) covering corridors, offices, industrial spaces, and commercial buildings. All available at trueisense.in. Occupancy sensor lighting delivers 40-80% lighting energy savings in suitable commercial applications.

PIR (Passive Infrared)

• Detection Method: Infrared heat and movement detection

• Detects Still Occupant?: No

• Affected by Temperature?: Yes — performance can degrade when ambient temperatures approach body temperature

• TRUEiSENSE Product: PIR Occupancy Motion Sensor

HF Microwave

• Detection Method: RF wave reflection from movement

• Detects Still Occupant?: Limited — may detect slow movement but not true stationary presence

• Affected by Temperature?: No

• TRUEiSENSE Product: 2x2 Motion Sensor Panel (HF)

24GHz FMCW Radar (True Presence)

• Detection Method: Radar, nano sensing, and breathing detection

• Detects Still Occupant?: Yes — accurately detects stationary occupants

• Affected by Temperature?: No

• TRUEiSENSE Products: ZENSOR, Wave Detector, Crux Detector and OCT Master Pro

True Presence Sensors: trueisense.in/collections/true-presence-sensors | Sensor Lighting: trueisense.in/collections/presence-sensor-lightings | Interactive Lab: trueisense.in/pages/interactive-sensor-lab

Frequently Asked Questions

Q: What is an occupancy sensor lighting system?

A: An occupancy sensor lighting system uses embedded sensing to detect whether a space is occupied — activating lighting when occupancy is detected and switching off or dimming when genuinely vacant. TRUEiSENSE provides systems across all technology types — PIR motion sensors for movement-based spaces and 24GHz FMCW radar true presence sensors for offices, meeting rooms, and hospitals.

Q: What is the difference between occupancy sensor and vacancy sensor?

A: An occupancy sensor activates lighting automatically when occupancy is detected — lights on when someone enters. A vacancy sensor requires manual switch-on but switches off automatically when vacant. TRUEiSENSE products function primarily as occupancy sensors with automatic activation for fully hands-free seamless lighting automation.

Q: Can occupancy sensors be used with existing lights?

A: Yes — TRUEiSENSE's standalone true presence sensors (ZENSOR Rs. 4,128.52, Wave Detector Rs. 3,499, Crux Detector Rs. 4,299, OCT Master Pro Rs. 3,899) install alongside existing lighting to add true presence sensing without replacing existing luminaires. Integrated sensor lighting products replace both luminaire and sensor.

Q: How does an occupancy sensor save energy?

A: Occupancy sensors ensure lights operate only when spaces are genuinely occupied — eliminating runtime in empty zones. TRUEiSENSE's true presence sensing further improves savings by eliminating false switch-offs that cause unnecessary re-activation cycles. Framework indicates 40-80% lighting energy savings in suitable commercial applications.

Q: What is the payback period for occupancy sensor lighting?

A: TRUEiSENSE's framework indicates a typical payback of 2-4 years depending on electricity tariff, facility size, operating hours, and products deployed. The Free Energy Savings Assessment at trueisense.in/pages/free-energy-savings-assessment provides a facility-specific ROI estimate.

Conclusion

Occupancy sensor lighting systems are one of the most impactful energy efficiency investments for commercial and industrial facilities in India. The key to realizing their full potential is matching the right sensing technology to each space — true presence sensors for stationary-occupancy environments, motion sensors for movement-based spaces — and supporting deployment with professional coverage planning and IoT monitoring for occupancy intelligence system performance verification.

Written from direct product testing and specification verification by the TRUEiSENSE Editorial Team. Product specifications, pricing, and model references are cross-verified against official brand listings and verified product pages on trueisense.in. Last updated: June 2026.