NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

What is the purpose of occupancy sensors in lighting systems?

1. To save energy by detecting occupancy

2. To automatically adjust temperature

3. To provide constant levels of illumination

4. To operate at scheduled times only

The correct answer is: To save energy by detecting occupancy

Occupancy sensors are primarily designed to save energy by detecting whether a space is occupied or unoccupied. These sensors work by using various technologies, such as passive infrared, ultrasonic, or dual technology, to sense movement or the presence of people within a designated area. When the sensor detects occupancy, it activates the lighting system, allowing lights to turn on only when necessary. Conversely, if the area is vacant, the sensor can automatically turn off the lights after a predetermined period of inactivity, thereby reducing energy consumption and extending the life of the lighting fixtures. The ability to save energy not only contributes to lower utility costs but also promotes environmental sustainability by minimizing energy waste. This feature is particularly valuable in commercial buildings, schools, and other facilities where lighting can be controlled more efficiently based on occupancy patterns rather than fixed schedules.