189.1 was jointly created by ASHRAE, the U.S. Green Building Council, and the Illuminating Engineering Society of North America. Like its 2009 predecessor, the 2011 version of the standard is written in code-intended (mandatory and enforceable) language so that it may be readily referenced or adopted by enforcement authorities to specify the minimum acceptable level of design criteria specifically for high-performance green buildings.
v2011 Overview

The design,construction and operation of building projects can result in significant impacts on our environment.  Such projects frequently convert land from biologically diverse natural habitat to impervious landscape with greatly reduced biodiversity. The U.S. Green Building Council has reported that buildings in the US produce 39% of U.S. carbon dioxide (CO2) emissions, are responsible for 40% of U.S. energy consumption, account for 13% of U.S. water consumption, and contribute 15% to GDP per year.

However, they also contribute significantly to the national economy and offer great potential for reducing energy use, greenhouse gas emissions, water use, heat island and light pollution effects, and impacts on the atmosphere, materials, and resources.

Based on input from all segments of the building community, the public at large, and project committee members, the ASHRAE Standing Standard Project Committee (SSPC) 189.1 uses the ASHRAE continuous maintenance process to update this standard to further reduce negative energy and environmental impacts through high-performance building design, construction, and operation.

Helpful Links

ASHRAE Home Page
ASHRAE Interpretations
Published Addenda

In The News

Training Materials

Annotated slides on individual topics regarding 189.1:

Lighting Related Provisions:
     Daylighting

Primary Differences Between v2011 and v2009

Since Standard 189.1 adopts by reference many requirements from other ASHRAE standards (particularly Standards 62.1 and 90.1), this version updates requirements to reflect the most current version of each referenced standard. Most importantly, it refers to Standards 90.1-2010 and 62.1-2010 rather than the 2007 version of each.

The standard replaces the Standard 90.1 across-the-board approach to reduction in interior lighting power density (LPD) with an LPD reduction based on specific building and space types.

For lighted signs visible during daytime hours, automatic controls are now required to reduce the lighting power to 35% of full power. For other signs, automatic controls must now turn off lighting during daytime hours and reduce the lighting power to 70% of full power after midnight.

For hotel guest rooms, automatic controls are now required to turn off power for lighting, television, and switched outlets and to reset HVAC setpoints within 30 minutes after the guest room becomes unoccupied.

As an alternative to permanent projections for shading, building projects may now employ automatically controlled building façade systems, such as dynamic glazing and shading systems, which modify solar heat gain factor (SHGF) in response to daylight levels or solar intensity.
v2014 Proposed Changes

v2014 of the sustainability standard, 189.1, is currently under development. It is scheduled to be published sometime late in 2014, at which point it becomes available to be adopted by states and other jurisdictions.

Proposed Addenda to 189.1

The follow lighting-related addenda are in various stages of the approval process and may or may not actually end up in the 2014 standard. The more substantial addenda have been bolded.

Light Pollution

Addendum X - the BUG tables from 2009 have been corrected to match the MLO tables

Lighting Quality

Addendum M - This addendum adds lighting quality requirements to the Indoor Environmental Quality section of Standard 189.1, recognizing that following good lighting practices is part of creating a high-performance building where occupants will be productive, comfortable, safe, and healthy. Control of lighting to suit individual or group needs, in particular, has been shown to increase comfort, satisfaction, and productivity of the people in the space. Likewise, the productivity, and therefore the long term sustainability of an enterprise, suffers when presentation lighting cannot be controlled to the correct level and uniformity of illuminance. While energy savings may very well be a side result of these provisions, they are specifically written to enhance the lighting quality of the subject spaces. 

Low Mercury Lamps

Addendum O - This addendum adds a new mandatory provision to Section 9 The Building’s Impact on the Atmosphere, Materials, and Resources, establishing maximum mercury content levels for certain types of electric lamps. The requirements are consistent with a new law in the State of Oregon governing the sale of electric lamps.

Daylight

Addendum AA - an overhaul of the daylighting requirements in IEQ
- The mandatory daylighting section has been moved to the prescriptive section to allow for the alternative of using the performance path to show equivalent daylighting benefits. 
- When relatively large spaces with high ceilings are directly under a roof it is cost-effective to daylight them with skylights and it is reasonable to daylight at least half of the area of the space. This addendum provides more flexibility in achieving minimum daylight requirements and the addendum adds occupancy exceptions to the requirement for diffusing glazing.  The rationale of Section 8.4.1.2(c) is to assure that surfaces in the daylight are highly reflective. Surface reflectance impacts the perception of the brightness of a space. However, based on user comments, some surface reflectance has been modified and clarity added to the language. Also, guidance has been provided regarding test standards and surface reflectance.
- The performance option (8.5.1) has been modified to more clearly align with the proposed
prescriptive path. 
- References have been added to the informative Appendix G. 
- Corresponding references to the sections modified by this proposal have been updated.

Addendum AG - brings the daylight related definitions in 189.1 into alignment with 90.1