Abstract
This paper presents basic knowledge of lighting starting by considering what light is and how it may be quantified. Light is a very small part, from about 380nm to 780 nm of the wavelength, of the electromagnetic spectrum. The CIE standard relative spectral sensitivity curve forms the basis of conversion from radiometric quantities to the photometric quantities involving luminous flux, illuminance, luminous intensity and luminance. The color of spectrum and that of objects are briefly explained in connection with the reflection and the transmission of light. Color perception results from the complex interaction between a light source, an object, the eye, and the brain. Sources of light in buildings, daylight and artificial light sources, are also briefly described including historical background. Finally, from the view points of usefulness, comfort and pleasantness, various features of interior lighting, e.g. required task illuminance, disability glare, perceived brightness, discomfort glare and techniques in lighting design, are presented.
