1Ian Lewin, Ph. D., FIES, L. C. Lamp Color and Visibility in Outdoor Lighting Design. Developed from a Paper Delivered to the 1999 Conference of the Institution of Lighting Engineers, Portsmouth, England.
10He Y, Rea M, Bierman A, et al. Evaluating light source efficacy under mesopic conditions using reaction times [J]. Journal of the Illumination Engineering Society , 1997, 26 ( 1 ) : 125- 138.