“RQQ Report No. 5 … The predetermination of Contrast Rendition Factors for the calculation of Equivalent Sphere Illumination,” Prepared by the Subcommittee on Veiling Reflections of the Committee on Recommendations for Quality and Quantity of Illumination of the IES, Journal of the IES, Vol. 2, No. 2, January 1973, p. 149.
2.
“Letter Ballot: RP for specification of ESI for specific task locations.”Design Practice Committee correspondence, March 1979.
