Occupancy Sensors and Vacancy Sensors

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Occupancy sensors and vacancy sensors are devices designed to detect when a space is occupied or unoccupied and trigger the lights accordingly. This energy-saving solution can dim or turn off the lights automatically after a set amount of time a particular space is unoccupied as well as turn the lights on when someone enters.

Also known as microwave or passive infrared motion sensors, this technology is a great way to save energy and keep your space secure.

In this article, we’re taking a closer look at occupancy sensors and vacancy sensors.

Occupancy Sensors and Vacancy Sensors

Commercial occupancy sensors and vacancy sensors that are DLC listed can result in huge benefits for your facility.

The quality of these lighting control systems has been tested and proven to offer energy-efficiency and reduce emissions that could lead to air pollution and climate change.

As a consequence, your goal as a business or homeowner to cut the expenses on utility bills can be achieved.

On the other hand, the benefits of occupancy and vacancy sensors cannot be overemphasized since they allow your lighting fixtures to be used efficiently.

Here, these fixtures only use electricity as needed and when it is required instead of running all day and thereby, wasting your money and energy at the same time.

Here’s what you need to know about occupancy sensors and vacancy sensors.

What are Occupancy Sensors?

Occupancy sensors also known as motion sensors, motion detectors, or motion light sensors, are employed in commercial applications.

These are automated lighting controls that turn on the lights in a room automatically once a person enters the room.

They also turn off the light automatically when there is no one in the facility.

What’s more, the field of view of these occupancy sensors can be adjusted as well as the length of time for the system to wait before the light is turned off when the room is unoccupied.

When it comes to the areas of application of occupancy sensors, they are used indoors in commercial buildings as part of an existing lighting system.

They are useful in locations that are frequented often, and some of these include offices, garages, conference rooms, copy rooms, utility rooms, lounges, and much more.

In a storage facility, for instance, it may be difficult for a person to hold goods and reach for the lights at the same time.

There are also different types of occupancy sensing technologies and some of these are:

  • Ultrasonic
  • Microwave sensors
  • Passive infrared (PIR)
  • Camera sensors (image processors)
  • Tomographic motion detection (TMD)

What are Vacancy Sensors?

The operation of vacancy sensors is quite similar to that of an occupancy sensor.

In this case, they turn off the lights automatically once a person leaves the room or motion is no longer detected.

Nonetheless, these lights have to be turned on manually, and this functionality sets them aside from occupancy sensors.

It is also worth noting that vacancy sensors are especially useful for high traffic areas, to ensure that the lights are not left on once the place is vacant.

I-Sense Series by T-1 Lighting

This new generation of passive infrared (PIR) and microwave (MIC) motions sensors provide the most advanced lighting system for commercial installations in need of an energy-saving solution.

The T-1 Lighting I-Sense Series includes several models to accommodate the needs of a wide range of commercial installations.

Passive Infrared Sensor Type

  • T1-SS123-PIR-BI-OD
  • T1-SS204
  • T1-SS123-PIR-BI-WP

Microwave Sensor Type

  • T1-SS119-MIC-ON-OFF
  • T1-SS119-MIC-BI
  • T1-SS110-MIC-BI-VT
  • T1-SS112A-MIC-BI-IP65

Learn more


Settling for the DLC listed commercial occupancy sensors and vacancy sensors can reap immense benefits for your business.

These sensors are part of a lighting control system that will ensure that light is only turned on when there is a need for it.

Therefore, you do not have to manually control how often the lights are left on in your building or try to recall if you’d taken the extra time to turn off all the lights.

That being said, it’s left for you to install these lighting control systems next to your light fixtures.

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