In November 2014, ASHRAE published ANSI/ASHRAE/USGBC/IES Standard 189.1, Standard for the Design of High-Performance Green Buildings, Except Low-Rise Residential Buildings. This updates the 2011 version and covers energy efficiency, site sustainability, water use, indoor environmental quality and the building’s impact on the atmosphere, materials and resources.
The standard allows states and other jurisdictions to regulate green building design using mandatory code language rather than LEED, which is a rating system for green buildings, not a code. One model code is the International Green Construction Code (IgCC), published by the International Code Council (ICC), which recognizes 189.1 as an alternative compliance standard.
In summer 2014, the governing organizations partnered to harmonize 189.1, the IgCC and the LEED rating system. Standard 189.1 will provide the baseline requirements aligned with LEED prerequisites and the IgCC. The IgCC will provide an alternate set of LEED prerequisites.
The lighting sections of 189.1 2014 focus on energy efficiency, light pollution, daylighting and occupant lighting control. The standard references the ANSI/ASHRAE/IES 90.1 2013 energy standard as the baseline of what must be done and then makes modifications and additions. For each major section, the requirements are divided into three parts: mandatory (prerequisites), prescriptive option (mandatory plus a set of prescriptive requirements, relatively simple) and performance option (simulation, relatively complex). Below is a brief description of the lighting requirements, minus daylighting.
Learn more here in this article I wrote for ELECTRICAL CONTRACTOR.
