Lighting Aspects of ASHRAE/IES 189.1-2014

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 green building standard—picture something like LEED in mandatory code language—covers energy efficiency, site sustainability, water use, indoor environmental quality and the building’s impact on the atmosphere, materials and resources. The 2014 version updates the 2011 version and includes a number of stretch requirements related to lighting and controls.

Another green building standard is the International Green Construction Code (IgCC), published by the International Code Council (which also publishes the IECC model energy code). IgCC recognizes 189.1 as an alternative compliance standard. During the summer of 2014, the USGBC, ASHRAE, AIA, IES and ICC agreed to harmonize 189.1, the IgCC and LEED.

Standard 189.1-2014’s major sections are divided into mandatory requirements plus a prescriptive and performance option. The mandatory requirements are just that, mandatory. The prescriptive option includes both the mandatory plus a series of prescriptive requirements. The performance option requires a building simulation and related calculations.

The lighting and control aspects of 189.1-2014 are related to energy efficiency, “light pollution,” daylighting and occupant lighting control. Standard 189.1-2014 references the ASHRAE/IES 90.1-2013 energy standard as the baseline and then presents various modifications. Therefore, these requirements, briefly described below (except for daylighting), must be achieved in addition to everything else that is applicable in 90.1-2013. Below is a brief description (except for daylighting). Consult 189.1-2014 for specific requirements.

Section 7, energy efficiency (mandatory): Energy consumption for certain lighting systems must be separately measured using a device that remotely communicates with a data acquisition system. The system must be able to store the data and provide user reports.

Section 7, energy efficiency (prescriptive option): Lower interior and exterior lighting power allowances must be achieved by applying a multiplier to the lighting power allowances in 90.1-2013.

Certain hotel and motel guest rooms must install automatic lighting controls that automatically turn OFF power to lighting and switched outlets after a period of vacancy.

Lighting in commercial and industrial storage stack areas must be controlled by an occupancy sensor that reduces lighting power by at least 50 percent.

Security and emergency lighting that must be continually illuminated is limited to 0.1W/sq.ft., though more can be added if connected to an automatic shutoff control.

Sign lighting power must be automatically reduced at certain times, with the level of reduction dependent on the lamp type and whether it operates during any daylight hours.

Exterior lighting serving uncovered parking areas must be controlled by a photosensor and astronomical time switch. Certain lighting must be reduced using an occupancy sensor.

Installed lighting covered by the ENERGY STAR labeling program must satisfy ENERGY STAR performance criteria. Specifically, integrated LED lamps and, if using the Alternate Renewables Approach (Section, other lamps and those commercial and residential luminaire types covered by the program.

Section 5, site sustainability (mandatory): Exterior luminaires must satisfy prescribed BUG ratings, indicating suitable control of backlight, uplight and glare. Uplight is additionally restricted based on lighting zone, which in turn is based on population density.

Section 8, indoor environmental quality (mandatory): Lighting in at least 90 percent of enclosed office spaces, if a certain size, must be controlled using multilevel controls or bilevel controls with separate task lighting. Multilevel control is required in listed multioccupant spaces. Gymnasium, auditorium, ballroom and cafeteria lighting must be zoned as at least two independently controlled groups of luminaires.

Section 8, indoor environmental quality (prescriptive option): Presentation lighting must be controlled separately from other general lighting.

Section 8, indoor environmental quality (performance option): Presentation lighting must satisfy certain illumination criteria based on the type of permanently installed presentation system.

Reprinted with permission from the Lighting Controls Association.

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