NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

In a lamp code, the letter "T" indicates that the lamp is what type?

1. Circular

2. Tall

3. Tubular

4. Tested by Underwriters Laboratories, Inc. (UL)

The correct answer is: Tubular

The letter "T" in lamp code signifies that the lamp is tubular in shape. This code system, primarily used in the lighting industry, categorizes various types of lamps based on their physical characteristics and intended applications. The "T" designation helps identify fluorescent tubes, which are widely used in commercial and residential lighting due to their efficiency and longevity. Tubular lamps come in different diameters, typically measured in eighths of an inch. For instance, a T8 lamp has a diameter of 1 inch (8 eighths), while a T12 lamp measures 1.5 inches in diameter. This designation is crucial for selecting the correct type of lamp for fixtures that are designed specifically for tubular lighting. The other options, while potentially relevant in the lighting industry, do not accurately describe what the "T" stands for in lamp codes.