Quantification of Trichromatic Light Sources to Achieve Tunable Photopic and Mesopic Luminous Efficacy of Radiation

ABSTRACT

This study attempts to quantify and optimize the luminous efficacy of radiation (LER) of trichromatic light sources in both photopic and mesopic visions. A new chromaticity-guided rather than spectrum-guided optimization approach is provided. LER contour maps formed by the gamut area of the three light source units are drawn in the chromaticity diagram. Based on these, functional models of LER in photopic and mesopic visions as well as scotopic/photopic (S/P) ratios are established as a function of chromaticity coordinates. Increasing trends for LER and S/P ratios in corresponding contour maps are proposed, which allow quick estimation and synthesis for ideal performance. By using the functional model, the ideal LER, S/P ratio of trichromatic light sources, and their combinations can be achieved. Based on this work, tunable combinations of LER and S/P ratios with chromaticity information can be achieved, which could provide more application possibilities for trichromatic light sources.

KEYWORDS:

• Chromaticity-guided optimization
• mesopic vision
• scotopic vision
• spectrum-guided optimization
• S/P ratios

Disclosure statement

The authors have no interests to declare.

Additional information

Funding

Qi Yao was supported by the National Natural Science Foundation of China (Grant Number 61605125) and Shenzhen Knowledge Innovation Program–Basic Research (Grant Number JCYJ20170818141507055). Qi Dai was supported by the Open Projects Fund of Key Laboratory of Ecology and Energy-saving Study of Dense Habitat (Tongji University), Ministry of Education, China (Grant Number 201810202).