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 2009 for New Construction and Major Renovations
This pilot credit is closed to new registrations
Provide for occupant comfort by establishing quality criteria for interior lighting within a space.
Choose four of the following strategies.
Register for the pilot credit
Note: the below submittals are suggestions, alternative forms of documentation or calculation strategies will be accepted.
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.
This Pilot Credit is now listed as closed to new registrations and I do not see it in the Innovation Catalog. Does that mean that this is no longer an option for an Innovation in Design credit?
Much of this credit has been incorporated into the LEED v4 credit. You may be able to pursue this as an innovation credit from another rating system depending on the rating system you are working in. If your v3 rating system allows this as a credit substitution then this approach will NOT work, but if it is not possible to pursue under your rating system then it will work.
What exactly is meant by "Use direct-only overhead lighting for 25% or less of the total connected lighting load for all regularly occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space.". We have difficulty understanding what is required here
Strategy D encourages the project to balance direct lighting with indirect, indirect-direct, and other types of lighting. This helps minimize glare, reduces the perceived brightness of the direct luminaires, and reduces contrast between ceiling and luminaire.
To meet this requirement, you must determine the total connected lighting load associated with all regularly occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space. and determine what percentage of that load is from direct-only overhead lighting. If this is 25% or less of the total connected lighting load then the requirements are met.
Do we have to add task lights to the total connected lighting load? Do we follow the rule of hard-wired/ plug-in rule where hard wired task lights are added to the total connected lighting load, plug-in task lights are not added to the total connected lighting load?
Thanks in advance,
Update - Step by step guidance on LEED BDC says that plug-in lights are included.
Can you be more specific about what exactly are direct-only lighting fixtures? Do for example luminescent fixtures with reflectors count as direct only? Or is this indirect light because of the (aluminium, transluscent or opaque) reflextors?
Lighting manufacturers classify fixtures as direct, direct-indirect, or indirect, based on what percentage of the light is emitted from which side of the fixture - the top or the bottom (or all sides). Downlights with a diffuser are still considered direct. Pendant fixtures can have a portion of their light output directed up to reflect off the ceiling. Autodesk has a simple diagram at http://sustainabilityworkshop.autodesk.com/buildings/light-fixtures-and-...
to illustrate this. It's an interesting requirement because the more direct lighting fixtures you use, the higher percentage of the lumens are in the space, so it is more energy efficient. I believe this requirement is an attempt to recognize that sometimes the most energy efficient solution is not the highest lighting quality solution - having a high percentage of direct downlight, if not done carefully, can lead to glare.
Thanx for the quick and clear reply!
We are appling for PC22 Lighting Quality. Regarding the requirements of Strategy E and Strategy F, what are the surfaces that are to be documented? We are looking at using the work surface to wall illumination requirement and I am not sure what or how to document what these strategies are directing. thank you for your assistance and direction.
For strategy E, the surfaces that must be documented are all ceilings, floors and wall surfaces for the regularly occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space. in the project.
For strategy F, consider the furniture and wall partitions within the project scope of work. All furniture used as a work surface and all wall partitions must be considered.
If all of our surfaces meet the minimum thresholds for reflectance - as documented by manufacturer-provided cut sheets - do we need to include calculations for a weighted average of surface reflectances? OR how have others documented requirements 5 & 6?
If all of the surfaces meet the minimum reflectance requirements, there is no need to provide weighted average calculations.
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.
Yes, the average wall brightness should be calculated considering only the opaque walls. Glazing is excluded.
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.
How can I be sure that I won't be spammed after the registration? Can someone guarantee that? Because it was something similar at the free xbox live codes website.
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