What best describes the difference between centralized and distributed lighting control systems?

What best describes the difference between centralized and distributed lighting control systems?

• A. Centralized controls decisions from a single point for the whole building, while distributed uses local devices
• B. Centralized uses local devices; distributed relies on a central controller
• C. Centralized is only for outdoor lighting; distributed is for indoor
• D. Centralized has no sensors; distributed requires sensors

Answer: (A)

The main idea being tested is where the decision-making happens in lighting control. In a centralized system, a single central controller or building management system analyzes inputs from across the building and decides how all lights should operate. In a distributed system, the control logic lives closer to the devices themselves—each fixture or local zone can make its own lighting decisions, with only light coordination as needed. So the description that centralizes decisions at one point for the whole building while using local devices for distributed control is the best fit. Centralized systems can still use sensors to judge occupancy or daylight, but the key distinction is where the decision is made. The other statements mix up where control resides, imply an indoor/outdoor split, or claim centralized setups lack sensors, which isn’t accurate.

The main idea being tested is where the decision-making happens in lighting control. In a centralized system, a single central controller or building management system analyzes inputs from across the building and decides how all lights should operate. In a distributed system, the control logic lives closer to the devices themselves—each fixture or local zone can make its own lighting decisions, with only light coordination as needed. So the description that centralizes decisions at one point for the whole building while using local devices for distributed control is the best fit. Centralized systems can still use sensors to judge occupancy or daylight, but the key distinction is where the decision is made. The other statements mix up where control resides, imply an indoor/outdoor split, or claim centralized setups lack sensors, which isn’t accurate.