NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

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If an incandescent lamp has the designation 65BR30, what does this signify about its wattage?

30W
65W
R class
3-2/3

The correct answer is: 65W

The designation "65BR30" provides important information regarding the lamp's characteristics, specifically its wattage and shape. The "65" in the designation indicates that the lamp operates at 65 watts. This figure reflects the amount of electrical power the lamp consumes when in use. The "BR" refers to the type of lamp; in this case, "BR" stands for "bulged reflector," which is a specific shape designed to reflect light in a particular direction, typically used in recessed lighting. The "30" signifies the diameter of the lamp in eighths of an inch. Therefore, a BR30 lamp has a diameter of 30/8 inches, or 3.75 inches. Understanding this coding system is essential for selecting the appropriate light source for a specific application, ensuring efficiency and compatibility with fixtures. Given this context, the choice indicating 65 watts accurately reflects the wattage specified in the lamp designation.