Architectural lighting works to serve and enhance the architecture, not merely as an accessory to create a cohesive spatial experience.
So, architectural lighting is an intersection of art (architecture) and technology (lighting). The architecture being illuminated or lighted may be commercial or residential.
Strictly speaking, architectural lighting is illumination for building design and function.
The term encompasses three main factors. The first is the building's aesthetic, which is important for residential and commercial applications. The second consideration is ergonomic or functional, any aspect which improves one's ability to live, work, function, relax or play, to make the space easier to use. The third aspect involves the efficiency of energy, ensuring that light is properly, which is to say economically or optimally, used and distributed.