NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

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If we see 75PAR30/HAL/SP10 as a lamp designation, which of the following statements is true about the lamp?

  1. 30W

  2. 10W

  3. 3 3/4 inches in diameter

  4. 9-3/8 inches in diameter

The correct answer is: 3 3/4 inches in diameter

The designation 75PAR30/HAL/SP10 provides specific information about the lamp's characteristics. The "PAR" stands for Parabolic Aluminized Reflector, which gives a certain beam pattern and light distribution, while the "30" indicates the diameter of the lamp in eighths of an inch. Therefore, a "30" designation means the lamp is 30 eighths of an inch, which converts to 3 3/4 inches in diameter. Understanding this designation is crucial, as it relates directly to how the lamp can be used in lighting designs and installations. The other components of the designation describe the lamp's wattage (75 watts) and specific features such as halogen type or spot beam, but it is the diameter notably that helps clarify physical compatibility with fixtures and settings.

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