Effectiveness of an alternative model for establishing mesopic luminance. (October 2019)

• Record Type: Journal Article
• Authors: Yao, Q; Fotios, S
• Is Part Of: Lighting research & technology. Volume 51:Number 6(2019)
• Page Start: 900
• Page End: 909
• Publication Date: 2019-10
• Subjects: Lighting -- Periodicals; 621.32
• DOI: 10.1177/1477153518800529
• Languages: English
• ISSNs: 1477-1535

Abstract

To determine mesopic luminance for a given photopic luminance and scotopic/photopic (S/P) ratio, the Commission Internationale de l'Eclairage (CIE) recommended system utilizes an equation. Whilst being accurate, it requires several iterations to achieve a stable result and requires the use of an adaptation coefficient. This article proposes an alternative approach, a model developed using a Rational Taylor function which does not require either iteration or an adaptation coefficient. Road lighting tends to use average photopic luminances in the range of 0.1 to 3 cd/m 2 ; within this range, the model has an average error of 0.28% against the iteration approach, which is sufficient for most practical purposes.