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| GY Framework Intents and Requirements LUC Credit3. |
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LUC CREDIT 3.2: VIEWS: NIGHT SKY
1 POINT
INTENT
To minimize light trespass from the building and site, reduce sky-glow
to increase night sky access, improve nighttime visibility through
glare reduction, and reduce development impact on nocturnal
environments.
REQUIREMENTS
Comply with local night sky ordinances or the following: (whichever is
more stringent)
For Interior Lighting:
The angle of maximum candela from each interior luminaire as located in
the building shall intersect opaque building interior surfaces and not
exit out through the windows.
OR
All non-emergency interior lighting shall be automatically controlled
to turn off during daylight and non-business hours. Provide manual
override capability for after hours use.
AND
For Exterior Lighting:
Only light areas as required for safety and comfort. Do not exceed 80%
of the lighting power densities for exterior areas and 50% for building
facades and landscape features as defined in ASHRAE/IESNA Standard
90.1-2004, Exterior Lighting Section, without amendments. All projects
shall be classified under one of the following zones, as defined in
IESNA RP-33, and shall follow all of the requirements for that specific
zone:
LZ1
— Dark (Park and Rural Settings)
Design exterior lighting so that all site and building-mounted
luminaries produce a maximum initial luminance value no greater than
0.01 horizontal and vertical foot-candles at the site boundary and
beyond. Document that 0% of the total initial designed fixture lumens
are emitted at an angle of 90 degrees or higher from nadir (straight
down).
LZ2
— Low (Residential areas)
Design exterior lighting so that all site and building mounted
luminaries produce a maximum initial luminance value no greater than
0.10 horizontal and vertical foot-candles at the site boundary and no
greater than 0.01 horizontal foot-candles 10 feet beyond the site
boundary. Document that no more than 2% of the total initial designed
fixture lumens are emitted at an angle of 90 degrees or higher from
nadir (straight down).
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.
LZ3
— Medium (Commercial/Industrial, High-Density Residential)
Design exterior lighting so that all site and building mounted
luminaries produce a maximum initial luminance value no greater than
0.20 horizontal and vertical foot-candles at the site boundary and no
greater than 0.01 horizontal foot-candles 15 feet beyond the site.
Document that no more than 5% of the total initial designed fixture
lumens are emitted at an angle of 90 degrees or higher from nadir
(straight down). 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.
LZ4
— High (Major City Centers, Entertainment Districts)
Design exterior lighting so that all site and building mounted
luminaries produce a maximum initial luminance value no greater than
0.60 horizontal and vertical foot-candles at the site boundary and no
greater than 0.01 horizontal foot-candles 15 feet beyond the site.
Document that no more than 10% of the total initial designed site
lumens are emitted at an angle of 90 degrees or higher from nadir
(straight down). 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.
LUC
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