Energy Smart Tip - Use Occupancy Sensors to Control Lighting

An occupancy sensor helps turn off lighting or equipment when a space is
unoccupied. Occupancy sensors are relatively inexpensive and easy to install.
Each occupancy sensor contains a motion sensor, an electronic control unit, and
a controllable switch/relay.

  • Price: Many models are available, with varying quality and number of features. Costs run between $10 and $180.
  • Savings: Occupancy sensors can cut down rest room lighting energy use by 50%.

Choosing a Location
Occupancy sensors result in the best energy savings in spaces where lights are
left on constantly in unoccupied areas, or in areas that people occupy
intermittently. Break rooms, conference rooms, storage closets, laundry rooms,
computer rooms, and some warehouse spaces are ideal candidates for
occupancy sensor installation. Some sensors are specifically designed for
rest rooms, stairwells, and hallways.

Occupancy sensors can be wall-mounted or ceiling-mounted (best in large, open
areas). Ideally, ceilings should be lower than 14 feet for a ceiling-mounted
occupancy sensor.


Types of Occupancy Sensors
Passive Infrared (PIR), the most common type of occupancy sensor, requires
no special wiring but has a smaller motion detection range.

Ultrasonic, another common type of occupancy sensor, requires special wiring
but has a larger motion detection range.

Dual/Multi-Technology incorporates both PIR and ultrasonic technology. It
requires special wiring and is the most robust type of occupancy sensor.

Resources:

U.S. Department of the Interior: “Lighting – Occupancy Sensors�'

About Lighting Controls

Passive Infrared Sensor Technology

For more energy efficiency tips, check out Quick Tips for Energy Efficiency.