What is a Luminaire?
Also called a “fixture,” a luminaire is the complete lighting unit. This includes the lamp itself, as well as all components needed to position the lamp, distribute the light, and connect the lamp to a power supply.
What is the Difference Between a Lamp and a Luminaire?
A lamp is the light source itself, whereas a luminaire is the entire unit required to create light. For example, the item we think of as a floor lamp is actually a luminaire. It includes everything needed to light the room. The bulb you screw into the floor lamp is the real lamp. It is the element that produces light, but it cannot produce light until it becomes part of the luminaire.
LED grow lights complicate this definition further, as they are both lamp and luminaire. The LEDs are already built into the entire fixture and cannot be replaced.