This flat reflected ceiling plan (RCP) sample represents the light fixtures layout.
"A light fixture (US English), light fitting (UK English), or luminaire is an electrical device used to create artificial light by use of an electric lamp. All light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement. Fixtures may also have a switch to control the light. Fixtures require an electrical connection to a power source; permanent lighting may be directly wired, and moveable lamps have a plug." [Light fixture. Wikipedia]
The lighting scheme example "Flat RCP" was created using the ConceptDraw DIAGRAM diagramming and vector drawing software extended with the Reflected Ceiling Plans solution from the Building Plans area of ConceptDraw Solution Park.