All light fixtures, except street lighting and those used on
one- or two-family dwellings, shall be designed, installed and maintained
to prevent light trespass, as specified in Subsections A and B below.
A. At a height of five feet above the property line of the subject property,
illuminations from light fixtures shall not exceed 0.1 footcandle
in a vertical plane on residentially zoned property.
B. Outdoor light fixtures installed and thereafter maintained shall
be directed so that there will not be any objectionable direct glare
source visible above a height of five feet from any property or public
roadway.
Illuminance and luminance requirements shall be as set forth
in the current editions of the Lighting Handbook of the Illuminating
Engineering Society of North America ("IESNA") and other IESNA publications.
This chapter adopts those standards.
A. Streetlighting. Average IESNA illuminance recommendations should
not be exceeded. IESNA average-to-minimum illuminance uniformity ratios
are to be used as a guide for designing safe and adequate roadway
lighting.
B. Outdoor parking facilities. Outdoor parking lot illuminance shall
be based on certain illuminance specifications recommended by the
IESNA, as contained in Schedule A.
C. All other illuminance uses shall not exceed IESNA recommendations.
D. Internally illuminated signs shall not exceed IESNA luminance recommendations.
No electric utility floodlight intended for property illumination
shall be located within the public right-of-way on any public roadway
or on any property unless:
A. The luminaire is sufficiently shielded and aimed so that no objectionable
direct glare source is visible at any point on the roadway where the
viewing height is five feet or greater and when the distance from
the mounting pole is 70 feet or greater.
B. The property being illuminated does not exceed the maximum maintained illuminance levels to perform the lighting task prescribed in §
195-3, Illuminance and luminance requirements, of this chapter.
C. All electric utility floodlights shall be subject to the requirements in §
195-2, Light trespass (nuisance light).