NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

Which option describes the benefit of an automatic dimming system?

1. Maintains a set light level based on occupancy

2. Automatically turns lights on at dusk

3. Adjusts light based on natural light availability

4. Turns all lights off after a preset time

The correct answer is: Adjusts light based on natural light availability

An automatic dimming system is designed to optimize energy usage while maintaining comfort and functionality in a space. The primary benefit described by the chosen answer is that it adjusts light levels based on the availability of natural light. This means that when there is sufficient natural light entering a space, the system reduces artificial lighting levels, which can lead to significant energy savings and reduced operating costs. This automatic adjustment helps in creating a more efficient lighting environment, ensuring that artificial lights only contribute the necessary amount of illumination needed for activities taking place within the area. Occupancy-based systems maintain light levels when people are present, and systems that turn lights on at dusk are useful for maintaining consistent illumination in the absence of daylight. Likewise, those that turn off lights after a preset time contribute to energy savings but do not optimize lighting levels based on current natural light contributions. Thus, while all those systems have their own merits, the unique capability of an automatic dimming system to balance artificial light with the amount of natural light available directly supports energy efficiency goals, which is clearly reflected in the chosen answer.