Page 114 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Sustainable Sites 95

FIGURE 2.8.1 Shielded exterior lighting along the beach in Fort Lauderdale. Lighting might
impact sea turtle habitat. (Photo taken by David Street on December 28, 2009.)

Each of the four lighting zones has four specific lighting distribution
requirements that must be met. These limit the horizontal lighting intensity at the
project property line, the vertical lighting intensity above the property line, the
maximum amount of lighting intensity at a specific distance from the property
edge, and the maximum amount of exterior lighting that can be directed with any
angle which may go upward. These four lighting distribution requirements for
each of the lighting zones are summarized in Table 2.8.3. Note that for three of the

Maximum
Number of Feet Allowed Percent
Maximum Beyond Site of Total Initial
Maximum Initial Boundary That Designed Fixture
Initial Vertical a Maximum Lumens Emitted
Horizontal Illuminance Initial Horizontal at an Angle of
Illuminance Value at Site Illuminance 90 or Higher
Value at Site Boundary of 0.01 fc Is from Nadir
Zone Boundary (fc) (fc) Allowed (MIDAL)
LZ1-dark 0.01 0.01 0 0
LZ2-low 0.10 ∗ 0.10 ∗ 10 2
LZ3-medium 0.20 ∗ 0.20 ∗ 15 5
LZ4-high 0.60 ∗ 0.60 ∗ 15 10

∗ For site boundaries that abut public rights-of-way, light trespass requirements may be met relative to
the curb line instead of the site boundary. LEED 2009 also allows for additional lighting at private
driveways abutting public roadways, with restrictions, in all the zones.

TABLE 2.8.3 Outdoor Lighting Zone Specific Exterior Lighting Requirements