Does lighting need more photopic luminous efficiency functions?
Year: 2002
Authors: Schanda1 J., Morren L., Rea M., Ronchi L., Walraven P.
Autors Affiliation: University of Veszprém, Hungary;
Université Catholique de Louvain, Louvain-la-Neuve, Belgium;
Lighting Research Center, Rensselaer Polytechn. Inst., USA;
National Institute of Optics, Florence, Italy; Emeritus TNO Human Factors, Soesterberg, The Netherlands
Abstract: In 1924 the Commission Internationale de l’Éclairage (CIE) established the photopic luminous efficiency function, V(), that subsequently has been used to measure luminance. Some have assumed luminance to be synonymous with brightness. Luminance is based mainly upon flicker photometry, and this methodology does not provide data predictive of the apparent brightness of steadily viewed lights. This paper discusses alternative photopic luminous efficiency functions that could be used for measuring luminance. A proper treatment of brightness is outside the scope of the present paper, although the CIE is actively studying this topic. Moreover, this paper does not discuss the scotopic luminous efficiency function established by the CIE in 1951.
Journal/Review: LIGHTING RESEARCH & TECHNOLOGY
Volume: 34 Pages from: 69 to: 78
KeyWords: photometry