LEED v4 – What's New?

a guest post by Lisa J. Reed, Lighting Designer

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As USGBC prepares to launch a new version of LEED, let’s take look at what’s in store for lighting. But before looking at LEED v4, check out our previous blog post about LEED 2009.

Modified from 2009: SSc8 (Sustainable Sites credit 8) Light Pollution Reduction – This credit still exists to encourage the reduction of sky glow, to eliminate light trespass, and to reduce glare. NOW it is SSc6, and it has been modified to incorporate IES BUG ratings. BUG stands for Backlight, Uplight and Glare.

Minor modifications from 2009: EAp2 (Energy and Atmosphere prerequisite 2) Minimum Energy Performance – This prerequisite still exists, but the baseline minimum standards have been updated to ANSI/ASHRAE/IESNA Standard 90.1–2010 (rather than 90.1-2007.)

NEW: EAp3 (Energy and Atmosphere prerequisite 3) Building Level Energy Metering – This is a new prerequisite. One of the requirements is for building electricity consumption to be metered at least monthly for five years after construction is complete.

Minor modifications from 2009: EAc1 (Energy and Atmosphere credit 1) Optimize Energy Performance – This credit still gives a graduated number of points based on energy saved but the baseline is updated to new standards, i.e. ANSI/ASHRAE/IESNA Standard 90.1-2010.

Major modifications from 2009: EQc6.1 (Indoor Environmental Quality credit 6.1) Controllability of Lighting – This includes some of the biggest changes for lighting.

  • For the first point in this category, "lighting control," at least 90% of individual occupant spaces must have individual lighting controls for the occupants, but to achieve this credit, the controls must give the occupants the ability to adjust the lighting to suit their task – with at least three lighting levels or scenes. (On, Off, Midlevel which is between 30% and 70% of full lighting output.) Additionally, multioccupant spaces are required to have multizone control systems with at least three scenes (On, Off, Midlevel.) These controls must be in sight of the lights being controlled. Also, lighting for any presentation or projection wall must be separately controlled.
  • For the second point in this category, "lighting quality," designers must employ at least four of eight lighting strategies. Read the details of these strategies on the USGBC website. These eight strategies address glare, color rendering, lamp life, the use of indirect lighting, high reflectance surface finishes, and maximum to minimum illuminance ratios for wall to work plane or ceiling to work plane surfaces.

Believe it or not, lighting related credits had fewer changes than some of the other LEED categories! What do you think of the changes? Where does LEED fall short? Where is it unreasonably difficult?

 

Lisa J Reed photo - Lighting Blog

Lisa J. Reed has been attracted to lighting (like a moth to a flame) for 20+ years. She is the Founding Principal at Envision Lighting Design, LLC in St. Louis, where she designs, teaches, and writes about architectural lighting. Connect with Lisa J. Reed on Google+.

 

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