Abstract
To predict the energetic effectiveness of a tubular light guide accurately, a theoretically founded approach has to be used rather than any empirical approximation. The computed illuminance below a light guide can become inaccurate if neither Fresnel’s equations nor realistic optical path lengths in a cupola are taken into consideration. It is shown that incorporation of both of them into a theoretical model results in lowered luminous flux below the light guide. Assumption of directionally independent transmission coefficient leads to average errors in luminous fluxes of about 10%. The peak errors are typically higher and correspond to lightbeams crossing a hemispherical top dome near its circular base. The solution concept used in this paper can improve predictions of energetic effectiveness for tubular light guides under diffuse daylight conditions.
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Devendra Singh Bisht, Vikas Kumar, Simranjit Singh, Harry Garg, and R. R. Shravana Kumar
Appl. Opt. 63(4) 1039-1047 (2024)
Korntip Tohsing, Michael Schrempf, Stefan Riechelmann, Holger Schilke, and Gunther Seckmeyer
Appl. Opt. 52(8) 1564-1573 (2013)
Wei-Feng Hsu, Yun-Chiang Hsu, and Yi-Ta Shen
Appl. Opt. 52(25) 6332-6343 (2013)