Optimize Energy Performance - 1-8 Points

Commercial Interiors - Energy & Atmosphere

Intent - To achieve increasing levels of energy performance beyond the prerequisite standard to reduce environmental and economic impacts associated with excessive energy use.

Requirements - EAc1.1 (Lighting Power) - 1-5 Points

Reduce connected lighting power density below that allowed by ANSI/ASHRAE/IESNA Standard 90.1-2007 (with errata but without addenda1) using either the space-by-space method or by applying the whole building lighting power allowance to the entire tenant space.

The points earned for reducing lighting power density below the standard are as follows:  

Projects in California may use Title 24-2005, Part 6 in place of ANSI/ASHRAE/IESNA Standard 90.1-2007.

Requirements - EAc1.2 (Lighting Controls) - 1-3 Points

Design the project to include 1 or more of the following independent strategies:

• Daylight controls for daylit areas: (1 point)
  • Install daylight responsive controls in all regularly occupied daylit spaces within 15 feet of windows and under skylights. Daylight controls must switch or dim electric lights in response to the presence or absence of daylight illumination in the space.
• Daylight controls for 50% of the lighting load: (1 point)
  • Install daylight responsive controls for 50% or more of the connected lighting load and demonstrate that 50% of the connected lighting load is daylight responsive. Daylight controls must switch or dim electric lights in response to the presence or absence of daylight illumination in the space.
• Occupancy sensors: (1 point)
  • Install occupancy sensors for 75% of the connected lighting load.

Referenced Standards

 ANSI/ASHRAE/IESNA Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential - Lighting (Section 9), www.ashrae.org, (800) 527-4723.

Design Strategies

• Design the connected lighting power to maximize energy performance. If the project warrants, consider a computer simulation model to assess the performance and identify the most cost-effective energy efficiency measures.
• Design the lighting controls to maximize energy performance.