In general lighting calculations, the fraction of initial lamp lumens that reach the work plane is the Co-efficient. The Co-efficiant is a function of luminaire efficiency, room surface reflectances, and room shape.
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The term used to refer to the complete light source package, including the inner parts as well the outer bulb or tube. "Lamp", of course, is also commonly used to refer to a type of small light fixture such as a table lamp.
Metal tungsten wire heated by the passage of electrical current, used to emit light in incandescent lamps. In fluorescent lamps the filament is coated with emission mix and emits electrons when heated.