Characteristics of light sources


This introductory chapter discusses the importance of light sources in visual perception. Various radiometric and photometric measures of illumination have been explained. The characteristics of various incandescence and discharge lamps are discussed and compared. Colour temperature, luminous efficacy, colour rendering and colour preference indices of light sources are also discussed. Theoretical light sources or illuminants are explained.

Key words

light sources; illuminants; radiometry; photometry; black body; colour rendering index; colour preference index

1.1 Introduction

According to the International Lighting Vocabulary, the definition of light is: ‘Any radiation capable of causing a visual sensation ...

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