NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

What factors contribute to the overall efficiency of a LED lighting system?

1. 120V lighting systems operate at lower primary voltage

2. LED lighting is inherently directional

3. Heat management is built into LED luminaires

4. 100 lumens per watt or more can be achieved

The correct answer is: LED lighting is inherently directional

LED lighting systems achieve higher overall efficiency through several key factors, one of which is the inherent directionality of LED light. Unlike traditional incandescent or fluorescent lights that emit light in all directions, LEDs are designed to emit light in a specific direction. This directional property allows for more effective use of light, as it minimizes the need for reflectors or diffusers that can absorb some of the light output, ultimately improving the system's efficiency. By directly targeting the illuminated area, LED fixtures can provide greater light levels where needed without unnecessary energy loss. This efficiency translates into lower energy consumption for the same amount of light output compared to non-directional lighting sources. Therefore, the design of LED lighting to emit light directionally plays a significant role in enhancing energy efficiency and effectiveness.