Luminaires system

A luminaire is a complete 
system for providing  the  
kind of light we  want,  


where we want it. 
The luminaire consists 
of the lamp,  the lamp 
socket, the ballast, if
 required,  the reflector, 
diffuser, shielding,
and the housing for all those things.
A luminaire needs only a mounting  
spot and a source of electricity to produce light.
To be an efficient producer of light, a luminaire must provide
balanced, glare-free illumination. Luminaires accomplish this
through the use of reflectors, which shape the light output, 
and shielding and diffusion devices that reduce glare and 
distribute the light evenly.