ANSI/ASHRAE/ICC/USGBC/IES Addendum Standard 189.1-2017: Standard for the Design of High-Performance Green Buildings. ASHRAE Technical Report 189.1, 2020.
ANSI/ASHRAE/ICC/USGBC/IES Addendum Standard 189.1-2017: Standard for the Design of High-Performance Green Buildings [pdf]Paper  abstract   bibtex   
addendum to ANSI/ASHRAE/ICC/USGBC/IES Standard 189.1-2017 Standard for the Design of High-Performance Green Buildings was published. The addendum makes changes to Section 8.3.5, which covers lighting. One of the biggest changes is to add TM-30 color rendition criteria to the section on Indoor Lighting Quality. Here’s the relevant text: 8.3.5.3 Color Rendition. At least 95% of lighting power of nominally white lighting within each enclosed space shall be provided by luminaires that meet the following criteria at full light output in accordance with IES-TM-30, Annex E, P2 and F3: 1. Rf of at least 85 2. Rf,h1 of at least 85 3. Rg of at least 92 4. Rcs,h1 of at least -7% but no greater than +19% Nominally white lighting is lighting that has chromaticity within the basic or extended nominal color correlated temperature (CCT) specifications of ANSI C78.377. Where a lighting system is capable of changing its spectrum, it shall be capable of meeting the color rendition requirements within each nominal CCT of 2700 K, 3500 K, 4000 K, and 5000 K, as defined in ANSI C78.377, that the system is capable of delivering.
@techreport{ashrae_ansiashraeiccusgbcies_2020,
	title = {{ANSI}/{ASHRAE}/{ICC}/{USGBC}/{IES} {Addendum} {Standard} 189.1-2017: {Standard} for the {Design} of {High}-{Performance} {Green} {Buildings}},
	url = {https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20addenda/189_1_2017_be_20200810.pdf},
	abstract = {addendum to ANSI/ASHRAE/ICC/USGBC/IES Standard 189.1-2017 Standard for the Design of High-Performance Green Buildings was published. The addendum makes changes to Section 8.3.5, which covers lighting. One of the biggest changes is to add TM-30 color rendition criteria to the section on Indoor Lighting Quality. Here’s the relevant text:

8.3.5.3 Color Rendition. At least 95\% of lighting power of nominally white lighting within each enclosed space shall be provided by luminaires that meet the following criteria at full light output in accordance with IES-TM-30, Annex E, P2 and F3:
1. Rf of at least 85
2. Rf,h1 of at least 85
3. Rg of at least 92
4. Rcs,h1 of at least -7\% but no greater than +19\%

Nominally white lighting is lighting that has chromaticity within the basic or extended nominal color correlated temperature (CCT) specifications of ANSI C78.377.

Where a lighting system is capable of changing its spectrum, it shall be capable of meeting the color rendition requirements within each nominal CCT of 2700 K, 3500 K, 4000 K, and 5000 K, as defined in ANSI C78.377, that the system is capable of delivering.},
	number = {189.1},
	author = {ASHRAE},
	year = {2020},
}
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