This pilot credit is proposed to expand on the current lighting requirements, in order to address the quality of the lighting in a space. Quality criteria focus on illuminance and reflectance to attempt to maximize occupant comfort and productivity.
Excerpted from LEED Pilot Credit Library
Provide for occupant comfort by establishing quality criteria for interior lighting within a space.
Meet the requirements of Section 9.5, Building Area Method; or Section 9.6 Space-by-Space Method; of ANSI/ASHRAE/IES Standard 90.1-2010 (with errata but without addenda).
For at least 90% of the regularly occupied floor area incorporate at least four of the following interior lighting features. [Regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building. are places where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building.] There are two categories: hardware and design.
For at least 50% of the regularly occupied floor area, have in place at least four of the following interior lighting features. There are two categories, hardware and design.
Suspended, wall-mounted, free-standing or partition-mounted indirect or di-rect/indirect ambient lightingLighting in a space that provides for general wayfinding and visual comfort, in contrast to task lighting, which illuminates a defined area to facilitate specific visual work. is in place for up to 75% of the connected lighting load.
Demonstrate that the interior lighting features have been maintained.
The homepage for the LEED Pilot Credit Library. The LEED Pilot Credit Library is intended to facilitate the introduction of new prerequisites and credits to LEED. This process will allow USGBC to test and refine credits through LEED 2009 project evaluations before they are sent through the balloting process for introduction into LEED.
Background for the LEED Pilot Credit Library is provided in this foundational document.
We are applying for this pilot credit in a building which facade consist of a double skin facade, the exterior layer is opaque with windows (existing facade of the building before project renovation) and the interior layer is completely glazed. Should the average wall brightness be calculated considering only the opaque walls (and therefore the glazed facade would not be included in the calculation)?.
The brightness of the interior glazed surface is 6%, so in case they were incuded in the calculations it would not be possible to fullfill this requirement even with all the opaque surfaces meeting the criteria.
I'm considering this credit for a project and am curious if anyone has developed a spreadsheet with surface reflectance calculations required in the design portion of credit requirements. I was hoping there would be a LEED Online form developed, but unfortunately that's not included in the process.
USGBC is currently working on resources for the LEED v4 credit. The resources are not final, but the draft may be useful for your project. Please send me an email at email@example.com if you are interested in more information.
I'm struggling with this credit as I don't see the link between the credit requirements and the submittals. As we have to incorporate 4 of 8 features this is pretty critical.
We're installing Philips PowerBalance LED fixtures in the ceiling which I believe covers us for all of the hardware features and also the ceiling/workspace luminance ratio (as there is no indirect lighting.) We could also design for the wall/ceiling/floor brightness percentages.
Can anyone help with the documentation I would need to provide to document these?
Good question. There is definitely a disconnect between the current credit requirements and the submittals listed here. We will update the submittals as soon as possible to fix this issue. Also, as I mentioned to Melissa, feel free to email me if you are interested in using the draft resources we are working on for the LEED v4 credit.
I would really like to see the draft resources. We're using the Powerbalance fixtures on a string of projects and I'd like to get as much experience with this credit as possible.
The content listed here on this page differs from the current content on the USGBC website - they have a similar but different set of requirements listed. Which one is currect? See http://www.usgbc.org/ShowFile.aspx?DocumentID=8197
Jonathan, sorry for the confusion. The USGBC content is more up to date. We had a mix-up in posting the information here that we will fix within the next couple days.
2) Is there a percentage of workstations that a task light is required for? What if I can meet recommended light levels without task lights?
3) This seems a little confusing as worded. Also, a fixture efficiency of 50% is quite low. This is the range of most can lights. How about greater than 80% for 95% of the fixtures? How does this relate to LED fixtures which are tested for total lumen1. A lumen is a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of 1 candle intensity.
2. A measurement of light output. output?
4) Is a source the lamp/ballast output or the total fixture output?
5) Every surface or something like 95% again?
6) Not sure how to verify this one.
8) Is this average to average ratio or max ceiling to min work surface ratio?
I see 1, 3, 4, 10 as relativly easy to comply with and document.
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