SS Credit 8: Light Pollution Reduction 1 Point Intent To minimi

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SS Credit 8: Light Pollution Reduction
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 from lighting on nocturnal
environments.

Requirements
Project teams must comply with 1 of the 2 options for interior lighting AND the requirement for exterior lighting.
For Interior Lighting
OPTION 1
Reduce the input power (by automatic device) of all nonemergency interior luminaires with a direct line of
sight to any openings in the envelope (translucent or transparent) by at least 50% between 11 p.m. and 5 a.m.After-hours override may be provided by a manual or occupant-sensing device provided the override lasts no more than 30 minutes.
OR
OPTION 2
All openings in the envelope (translucent or transparent) with a direct line of sight to any nonemergency
luminaires must have shielding (controlled/closed by automatic device for a resultant transmittance of less
than 10% between 11 p.m. and 5 a.m.).
For Exterior Lighting
Light areas only as required for safety and comfort. Exterior lighting power densities shall not exceed those
specified in ANSI/ASHRAE/IESNA Standard 90.1-2007 with Addenda 1 for the documented lighting zone.
Justification shall be provided for the selected lighting zone. Lighting controls for all exterior lighting shall
comply with section 9.4.1.3 of ANSI/ASHRAE/IESNA Standard 90.1- 2007, without amendments1.
Classify the project under 1 of the following zones, as defined in IESNA RP-33, and follow all the requirements for that zone:
LZ1: Dark (developed areas within national parks, state parks, forest land and rural areas)
Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial
illuminance value no greater than 0.01 horizontal and vertical footcandles at the site boundary and beyond.
Document that 0% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at
an angle of 90 degrees or higher from nadir (straight down).
LZ2: Low (primarily residential zones, neighborhood business districts, light industrial areas with
limited nighttime use and residential mixed-use areas)
Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial
illuminance value no greater than 0.10 horizontal and vertical footcandles at the site boundary and no greater
than 0.01 horizontal footcandles 10 feet beyond the site boundary. Document that no more than 2% of the
total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or
higher from nadir (straight down).
LZ3: Medium (all other areas not included in LZ1, LZ2 or LZ4, such as commercial/ industrial, and
high-density residential) Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial illuminance value no greater than 0.20 horizontal and vertical footcandles at the site boundary and no greater than 0.01 horizontal footcandles 15 feet beyond the site. Document that no more than 5% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).
LZ4: High2 (high-activity commercial districts in major metropolitan areas)
Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial
illuminance value no greater than 0.60 horizontal and vertical footcandles at the site boundary and no greater than 0.01 horizontal footcandles 15 feet beyond the site. Document that no more than 10% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).
LZ2, LZ3 and LZ4 - 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.
For All Zones
Illuminance generated from a single luminaire placed at the intersection of a private vehicular driveway and
public roadway accessing the site is allowed to use the centerline of the public roadway as the site boundary for a length of 2 times the driveway width centered at the centerline of the driveway.

Potential Technologies & Strategies
Adopt site lighting criteria to maintain safe light levels while avoiding off-site lighting and night sky pollution.
Minimize site lighting where possible, and use computer software to model the site lighting. Technologies to reduce light pollution include full cutoff luminaires, low-reflectance surfaces and low-angle spotlights.


SSC 8: 减少光污染
1分

目的
最小化建筑和场址中灯光外泄，减少天空眩光，提高天空可见和透视率，改善夜空环境，减少
对夜行环境的影响。

要求
工程必须符合室内照明的选项之一，并且同时满足室外照明的各要求。
室内照明
选项1
对于室内照明其中所有可在围护结构上洞口(半透明或全透明)有直射光所有照明器具（除
应急灯），一律采用措施在晚11点至早5点时段降低输入功率50%以上（可采用自控方式）。
下班关灯可采用手动，或采用人体传感器自动关灯，延迟驶不超过30分钟。
或者
选项2
围护结构上所有洞口(半透明或全透明)如果有灯光直接射线的，必须在晚11点至早5点时段，
有遮挡（饭馆可采用自控方式，使得透光率小于10%）。
室外照明
只在有安全和舒适要求的区域设置照明，照明功率密度不超过标准 ANSI/ASHRAE/IESNA
90.1-2007 (无附录1) 的照明类别规定值。照明控制满足该标准的室外照明章节要求。
工程按以下类别确认其分区情况，标准为IESNA RP-33, 并遵守该区所有的要求：
LZ1 — 黑暗区 (公园和农村设置)
场址和建筑照明设计时，所配置的灯具落在场址周界上的烛光值在水平和垂直方向，最初的值
不大于0.01，说明设计采用的灯具0%照射角度没有大于90度（垂直下射）。
LZ2 — 低照明区 (住宅区)
场址和建筑室外照明设计所配置的灯具在场址周界上产生的水平、垂直照度不大于0.10，并且
在周界外10英尺范围的水平照度不大于0.01烛光。说明只有不到2%灯具的照射角是90度或更大
（垂直下射）。对于周界是公共走道的情况，光的泄漏只到路边，而不到场址界。
LZ3 — 中度照明区 (商业/工业，高密度住宅)
场址和建筑室外照明设计所配置的灯具在场址周界上产生的水平、垂直照度不大于0.20，并且
在周界外15英尺范围的水平照度不大于0.01烛光。说明只有不到5%灯具的照射角是90度或更大
（垂直下射）。对于周界是公共走道的情况，光的泄漏只到路边，而不到场址界。
LZ4 — 高亮度照明 (城市主中心，娱乐区)
场址和建筑室外照明设计所配置的灯具在场址周界上产生的水平、垂直照度不大于0.60，并且
在周界外15英尺范围的水平照度不大于0.01烛光。说明只有不到10%灯具的照射角是90度或更
大（垂直下射）。对于周界是公共走道的情况，光的泄漏只到路边，而不到场址界。
LZ2, LZ3􀩠LZ4 – 如果场址边界比邻公共道路，则灯光外泄之要求只考虑到道路边沿，而非场址边
界。
所有照明区
由单个光源产生的灯光，如果与接入场址的私人行车道和公共道路正交，可以公共道路中心线
代表场址边界，边界长度为道路宽度的两倍，中心线取车行道中线。

技术措施和策略
场址采用的照明标准应符合安全需要，同时不使光溢出场址，防治污染夜空。在可能的情况下
采用计算机模拟场址照明以使其最小化。降低光污染的技术有全截角灯具、低反射表面和小角
度点式光源。