The Illuminating Engineering Society (IES) has published three new lighting standards: ANSI/IES TM-40-24 IES Technical Memorandum: IES Method for Determining Correlated Color Temperature (CCT) and Distance from the Planckian Locus of Light Sources Prior to the publication of this Technical Memorandum, no method for calculating CCT (nor Duv) has been formalized by a relevant [...]