The subject of illumination engineering pertains to the principles of light control in interior lighting architecture like domestic and factory lighting as well as outdoor applications such as highway lighting and floodlighting. In this modernized era, electrically originated light is favoured as the other source of illumination, due to an account of its steady light output, low cost, cleanliness, ease of control, and reliability. Besides its decorative and aesthetic facet, good lighting has a rigorously functional value in lowering the fatigue of the workers, protecting their health, raising productivity, etc. The science of illumination engineering has, therefore, become important.