NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

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Prepare for the NALMCO Certified Apprentice Lighting Technician Test. Enhance your knowledge with multiple-choice questions, tips, and exam insights to ensure success. Get ready to shine in your exam!

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Which two basic types of LEDs exist?

Indicator-type
Electronic-type
Illuminator-type
Radiant heat-type

The correct answer is: Indicator-type

The two basic types of LEDs are primarily categorized based on their intended applications, and among the options provided, indicator-type LEDs are the most recognizable and widely used in various devices. Indicator-type LEDs are designed to indicate the status of a device or system, such as power indicators on appliances, status lights on electronics, or notification signals on various gadgets. They typically emit a steady light when active, allowing users to easily discern operational states at a glance. In contrast, while the term "illuminator-type" might suggest an LED designed to provide lighting for spaces, it is not a recognized category in the same way that indicator-type LEDs are. The other options, including electronic-type and radiant heat-type, do not accurately describe standard LED classifications in common usage. Therefore, the correct answer highlights the fundamental distinction between the types of LEDs based on their primary functional uses.