I've got a project trying to meet the requirements of LZ2 under this credit. the LEED boundary abuts the public rights-of-way at all points. It is essentially an island between streets. The language in the referece guide states that if this is the case, then the light trespass requirements may be met relative to the curb line instead of the site boundary. Does the "curb line" mean the curb line across the street or the curb line on which our LEED building sits, which is already our LEED boundary? SSc8 ...

My client is expanding an existing building onto an adjacent tract. Our LEED boundary is the interface between the new and existing buildings, extended across what was an existing parking lot. The project conforms to LEED requirement for LZ3 along the entire boundary with other owners, but, of course, across the parking lot we don't create a dark zone to satisfy LEED. The multiple building...

Does anyone know of a manufacturer that makes a parking lot lighting fixture that casts light in only one direction, instead of 2 or 4 directions? SSc8 ...

The site boundary of our building is lined with quite tall and dense trees. Should these be incorporated into the footcandle calculations? If the trunk of the tree is inside the boundary (but the leaves are both outside and inside) and the tree prevents light leakage at vertical plane on site boundary, we believe that they should be. However, typical calculation software cannot model trees. Has anyone had any experience with this? Thanks. SSc8 ...

Question on LEED NC 2009 SSc8- For Option #1 on the interior lighting portion, is having an occupancy sensor alone installed on fixtures that have a direct line of sight sufficient to meet this requirement? The credit states the the fixtures need to be reduced by 50%, which is easily attainable by an occupancy sensor that cuts them by 100%. It also states they need to be off from 11pm-5am and if manually over-ridden, turn back off in less than 30 minutes. It would seem that if the time delay on the sensors was set to 30 minutes this would satisfy the requirement, however the 30 minute time limit...

Our project is in an urban site; the LEED boundary goes beyond the property line and sometimes the curbline. The presence of city-owned and operated street lights within our LEED boundary pretty much nixes our chances of achieving this credit. What do you think of using EBOM SSc8 Option 3 as an alternate compliance path? SSc8 ...

We have a 2 m. high brick wall running all around out site. This wall belongs to the property so it is within the site boundary and the site boundary runs exactly along the outside surface of the wall. When making ground plane photometry calculations on the site boundary, should the calculation points be inside the wall or outside the wall? When outside, the values are obviously 0 fc due to the fact that luminaries are inside the site and the wall is casting shadow to the other side (although the 10 feet beyond site boundary calculations are not zero). When we calculate inside, we get higher...

in a parking lot. This is a game changer as this is much greater light than what the IES would require (typically we can go as low as.2 at the darkest point and we were shooting for an average of 1 fc) for general lighting levels for this type of parking lot and building. The engineers have done some quick calc's and are confident that the LEED credit for light pollution reduction (which requires us...

What is the height off the ground at which the vertical Fc are are to measured at the property line? SSc8 ...

We are going to provide the LED strip along the vertical line of the building facade. If we assume that the 50% of their lumen is above 90 degree from nadir then our bldg. will exceed the 10% lumen calculation for LZ4. Is there any exception to omit this LED strip light from the calculation? Or the installation of the LED inside the curb and use their spilled indirect light can help this? SSc8 ...