The ever increasing development and marketing of lamps has imposed a greater need upon the lighting designer to understand the different operating characteristics of these various lamps and their application in lighting designs. Luminous efficacy must be treated with great care when used to compare light sources of different types, as it conveys no information about variation of light output with age, colour appearance, colour rendering, mortality or flexibility of control
Published in:
Engineering Science and Education Journal
(Volume:2
,
Issue:
2
)
Date of Publication: Apr 1993