What is commonly referred to as a lamp in the industry?

The term "lamp" in the lighting industry traditionally refers to the light bulb itself, which is the component that produces light when electrical current passes through it. This is the correct answer because the fundamental function of a lamp is to generate illumination, and it is often used to describe various types of bulbs, including incandescent, fluorescent, and LED options.

In this context, a light fixture (not the lamp) is the housing or mounting that holds the lamp and often has features for directing the light, whereas a decorative element in lighting could refer to design aspects of a fixture rather than the light source itself. Similarly, a ceiling-mounted light source generally refers to the fixture that houses the lamp, rather than the lamp itself. Therefore, considering these definitions, identifying a lamp as the light bulb aligns with industry terminology and usage.