NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

What type of control system frequently adjusts light output based on measured levels?

1. Dimmer switch control

2. Low-voltage control system

3. Daylight harvesting system

4. Occupancy sensor control

The correct answer is: Low-voltage control system

The most suitable choice for a control system that frequently adjusts light output based on measured levels is the daylight harvesting system. This system utilizes sensors to measure the amount of natural daylight entering a space and adjusts the artificial lighting accordingly. The goal is to maintain a consistent lighting level while maximizing the use of available daylight, which can enhance energy efficiency and create a more comfortable environment. In this context, a daylight harvesting system helps in reducing energy consumption by lowering the artificial light output when adequate natural light is available. This continuous adjustment based on real-time measurements makes it particularly effective in managing light levels throughout the day. While the other options can include light control features, they do not specifically focus on the adjustment of light output based on measured natural light levels. For instance, a dimmer switch control allows for manual adjustment of light levels but does not automatically assess external light conditions. Similarly, a low-voltage control system does not inherently automate changes in response to daylight, and occupancy sensors primarily focus on detecting human presence rather than light levels.